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<!doctype html><html lang=it><head><meta charset=utf-8><meta name=robots content="all,follow"><meta name=googlebot content="index,follow,snippet,archive"><meta name=viewport content="width=device-width,initial-scale=1"><title>SpeedTech | Blog - Cifrare e comprimere le email lato server</title>
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<meta name=author content><meta name=keywords content="Servizi di informatica,Sviluppo software,Sicurezza,VPN,Firewall,Servers con Linux,Email privata"><meta name=description content="SpeedTech - Servizi di informatica"><meta name=generator content="Hugo 0.123.7"><link href=/css/main.css rel=stylesheet><link rel="shortcut icon" href=/img/favicon.ico type=image/x-icon><link rel=apple-touch-icon href=/img/apple-touch-icon.png><meta property="og:title" content="Cifrare e comprimere le email lato server"><meta property="og:description" content="Per migliorare la sicurezza e la privacy degli utenti e risparmiare spazio su disco, il mail server
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Dovecot permette di cifrare e comprimere i files che contengono la posta elettronica."><meta property="og:type" content="article"><meta property="og:url" content="https://speedtech.it/blog/cifrare-comprimere-email-server/"><meta property="og:image" content="https://speedtech.it/images/blog/encrypt-compress-emails-on-server.jpg"><meta property="article:section" content="blog"><meta property="article:published_time" content="2022-07-08T00:00:00+00:00"><meta property="article:modified_time" content="2022-07-08T00:00:00+00:00"><meta property="og:site_name" content="SpeedTech"><script src=/js/htmx/htmx.min.js defer></script><script src=/js/main.js defer></script></head><body hx-boost=true lang=it><nav id=topnav><div class=container><a class=navbar-brand href=/><img class=img-fluid src=/img/logo.svg alt=SpeedTech></a><div id=topmenu><button id=responsive-button onclick='htmx.toggleClass(htmx.find("#topmenu"),"responsive")'><i class="icon icon-menu"></i></button><ul><li class=dropdown><a href=/#home-bottom role=button>Servizi</a><ul class=submenu><li><a href=/servizio/sviluppo-applicazioni/ title="Progettazione e sviluppo di applicazioni software"><i class="icon icon-desktop"></i>
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Domotica open source</a></li></ul></li><li><a href=https://brainminder.it>BrainMinder</a></li><li><a href=https://forgejo.speedtech.it/explore/repos>Git repository</a></li><li><a href=/#contact>Contatto</a></li><li class=active><a href=/blog>Blog</a></li><li><a href=https://speedtech.it/en/blog/encrypt-compress-email-server/>EN</a></li></ul></div></div></nav><header class=blog-single><div class=container><div class=row><div class="col s12 m9 l9"><h2><a href=/blog/>Blog</a></h2><h3 class=title>Cifrare e comprimere le email lato server</h3></div></div></div></header><div id=page-content><div class=container><div class=row><div class="col s12 m9 l9 articlecontent"><p class=text-center><img class=img-fluid src=/images/blog/encrypt-compress-emails-on-server.jpg width=400></p><div style=text-align:justify;margin-bottom:16px><p>Per migliorare la sicurezza e la privacy degli utenti e risparmiare spazio su disco, il mail server
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<a href=https://www.dovecot.org/>Dovecot</a> permette di cifrare e comprimere i files che contengono la posta elettronica.</p><p>La compressione avviene tramite il plugin <code>zlib</code> mentre la cifratura tramite il plugin <code>mail_crypt</code>.</p><div class=highlight><pre tabindex=0 style=color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4><code class=language-bash data-lang=bash><span style=display:flex><span>mail_plugins <span style=color:#f92672>=</span> $mail_plugins zlib mail_crypt
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</span></span></code></pre></div><p>I due plugin possono essere poi configurati con diversi opzioni</p><div class=highlight><pre tabindex=0 style=color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4><code class=language-bash data-lang=bash><span style=display:flex><span>plugin <span style=color:#f92672>{</span>
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</span></span><span style=display:flex><span> mail_crypt_global_private_key <span style=color:#f92672>=</span> </etc/dovecot/crypt/master.key
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</span></span><span style=display:flex><span> mail_crypt_global_public_key <span style=color:#f92672>=</span> </etc/dovecot/crypt/master.pub
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</span></span><span style=display:flex><span> mail_crypt_curve <span style=color:#f92672>=</span> prime256v1
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</span></span><span style=display:flex><span> mail_crypt_save_version <span style=color:#f92672>=</span> <span style=color:#ae81ff>2</span>
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</span></span><span style=display:flex><span> zlib_save_level <span style=color:#f92672>=</span> <span style=color:#ae81ff>6</span>
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</span></span><span style=display:flex><span> zlib_save <span style=color:#f92672>=</span> lz4
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</span></span><span style=display:flex><span><span style=color:#f92672>}</span>
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</span></span></code></pre></div><p>Per la cifratura è inoltre necessario generare la coppia di chiavi : privata (<code>master.key</code>) per cifrare e pubblica (<code>master.pub</code>) per decifrare.</p><p>In questo modo nel caso vi fosse un’intrusione sul server ed i files delle email venissero trafugati, sarebbero illeggibili senza la chiave privata di decodifica.</p><p>Dal momento in cui la codifica e la compressione vengono attivate, tutti i nuovi messaggi verranno automaticamente cifrati e compressi in modo
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completamente trasparente per l’utente finale.</p><p>Per cifrare e comprimere la posta preesistente è sufficiente spostare i messaggi da una cartella all’altra tramite un client IMAP.
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In alternativa, con il seguente script bash è possibile avviare la cifratura di tutti i files di posta nella directory di esempio <code>/var/vmail/domain/user/Maildir</code> (la compressione non è possibile).</p><div class=highlight><pre tabindex=0 style=color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4><code class=language-bash data-lang=bash><span style=display:flex><span>find /var/vmail/domain/user/Maildir -type f -regextype egrep -regex <span style=color:#e6db74>'.*S=.*W=.*'</span> | <span style=color:#66d9ef>while</span> read -r file; <span style=color:#66d9ef>do</span>
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</span></span><span style=display:flex><span><span style=color:#66d9ef>if</span> <span style=color:#f92672>[[</span> <span style=color:#66d9ef>$(</span>head -c7 <span style=color:#e6db74>"</span>$file<span style=color:#e6db74>"</span><span style=color:#66d9ef>)</span> !<span style=color:#f92672>=</span> <span style=color:#e6db74>"CRYPTED"</span> <span style=color:#f92672>]]</span>; <span style=color:#66d9ef>then</span>
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</span></span><span style=display:flex><span>echo $file
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</span></span><span style=display:flex><span>doveadm fs put crypt private_key_path<span style=color:#f92672>=</span>/etc/dovecot/crypt/master.key:public_key_path<span style=color:#f92672>=</span>/etc/dovecot/crypt/master.pub:posix:prefix<span style=color:#f92672>=</span>/ <span style=color:#ae81ff>\
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</span></span></span><span style=display:flex><span><span style=color:#ae81ff></span> <span style=color:#e6db74>"</span>$file<span style=color:#e6db74>"</span> <span style=color:#e6db74>"</span>$file<span style=color:#e6db74>"</span>
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</span></span><span style=display:flex><span> chmod <span style=color:#ae81ff>600</span> <span style=color:#e6db74>"</span>$file<span style=color:#e6db74>"</span>
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</span></span><span style=display:flex><span> chown vmail:vmail <span style=color:#e6db74>"</span>$file<span style=color:#e6db74>"</span>
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</span></span><span style=display:flex><span><span style=color:#66d9ef>fi</span>
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</span></span><span style=display:flex><span><span style=color:#66d9ef>done</span>
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</span></span></code></pre></div><p>Nel caso invece fosse necessario accedere ad uno o più files di email in chiaro, si possono utilizzare i seguenti scripts :</p><p>Per decifrare solamente (nel caso in cui i files non siano stati compressi)</p><div class=highlight><pre tabindex=0 style=color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4><code class=language-bash data-lang=bash><span style=display:flex><span>find /var/vmail/domain/user/Maildir -type f -regextype egrep -regex <span style=color:#e6db74>'.*S=.*W=.*'</span> | <span style=color:#66d9ef>while</span> read -r file; <span style=color:#66d9ef>do</span>
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</span></span><span style=display:flex><span><span style=color:#66d9ef>if</span> <span style=color:#f92672>[[</span> <span style=color:#66d9ef>$(</span>head -c7 <span style=color:#e6db74>"</span>$file<span style=color:#e6db74>"</span><span style=color:#66d9ef>)</span> <span style=color:#f92672>==</span> <span style=color:#e6db74>"CRYPTED"</span> <span style=color:#f92672>]]</span>; <span style=color:#66d9ef>then</span>
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</span></span><span style=display:flex><span> echo $file
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</span></span><span style=display:flex><span> doveadm fs get crypt private_key_path<span style=color:#f92672>=</span>/etc/dovecot/crypt/master.key:public_key_path<span style=color:#f92672>=</span>/etc/dovecot/crypt/master.pub:posix:prefix<span style=color:#f92672>=</span>/ <span style=color:#ae81ff>\
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</span></span></span><span style=display:flex><span><span style=color:#ae81ff></span> <span style=color:#e6db74>"</span>$file<span style=color:#e6db74>"</span> > <span style=color:#e6db74>"/tmp/</span><span style=color:#66d9ef>$(</span>basename <span style=color:#e6db74>"</span>$file<span style=color:#e6db74>"</span><span style=color:#66d9ef>)</span><span style=color:#e6db74>"</span>
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</span></span><span style=display:flex><span> <span style=color:#66d9ef>if</span> <span style=color:#f92672>[[</span> -s <span style=color:#e6db74>"/tmp/</span><span style=color:#66d9ef>$(</span>basename <span style=color:#e6db74>"</span>$file<span style=color:#e6db74>"</span><span style=color:#66d9ef>)</span><span style=color:#e6db74>"</span> <span style=color:#f92672>]]</span>; <span style=color:#66d9ef>then</span>
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</span></span><span style=display:flex><span> chmod <span style=color:#ae81ff>600</span> <span style=color:#e6db74>"/tmp/</span><span style=color:#66d9ef>$(</span>basename <span style=color:#e6db74>"</span>$file<span style=color:#e6db74>"</span><span style=color:#66d9ef>)</span><span style=color:#e6db74>"</span>
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</span></span><span style=display:flex><span> chown vmail:vmail <span style=color:#e6db74>"/tmp/</span><span style=color:#66d9ef>$(</span>basename <span style=color:#e6db74>"</span>$file<span style=color:#e6db74>"</span><span style=color:#66d9ef>)</span><span style=color:#e6db74>"</span>
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</span></span><span style=display:flex><span> mv <span style=color:#e6db74>"/tmp/</span><span style=color:#66d9ef>$(</span>basename <span style=color:#e6db74>"</span>$file<span style=color:#e6db74>"</span><span style=color:#66d9ef>)</span><span style=color:#e6db74>"</span> <span style=color:#e6db74>"</span>$file<span style=color:#e6db74>"</span>
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</span></span><span style=display:flex><span> <span style=color:#66d9ef>else</span>
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</span></span><span style=display:flex><span> rm <span style=color:#e6db74>"/tmp/</span><span style=color:#66d9ef>$(</span>basename <span style=color:#e6db74>"</span>$file<span style=color:#e6db74>"</span><span style=color:#66d9ef>)</span><span style=color:#e6db74>"</span>
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</span></span><span style=display:flex><span> <span style=color:#66d9ef>fi</span>
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</span></span><span style=display:flex><span><span style=color:#66d9ef>fi</span>
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</span></span><span style=display:flex><span><span style=color:#66d9ef>done</span>
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</span></span></code></pre></div><p>Per decifrare e decomprimere :</p><div class=highlight><pre tabindex=0 style=color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4><code class=language-bash data-lang=bash><span style=display:flex><span>find /var/vmail/domain/user/Maildir -type f -regextype egrep -regex <span style=color:#e6db74>'.*S=.*W=.*'</span> | <span style=color:#66d9ef>while</span> read -r file; <span style=color:#66d9ef>do</span>
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</span></span><span style=display:flex><span><span style=color:#66d9ef>if</span> <span style=color:#f92672>[[</span> <span style=color:#66d9ef>$(</span>head -c7 <span style=color:#e6db74>"</span>$file<span style=color:#e6db74>"</span><span style=color:#66d9ef>)</span> <span style=color:#f92672>==</span> <span style=color:#e6db74>"CRYPTED"</span> <span style=color:#f92672>]]</span>; <span style=color:#66d9ef>then</span>
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</span></span><span style=display:flex><span> echo $file
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</span></span><span style=display:flex><span> doveadm fs get compress lz4:0:crypt:private_key_path<span style=color:#f92672>=</span>/etc/dovecot/crypt/master.key:public_key_path<span style=color:#f92672>=</span>/etc/dovecot/crypt/master.pub:posix:prefix<span style=color:#f92672>=</span>/ <span style=color:#ae81ff>\
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</span></span></span><span style=display:flex><span><span style=color:#ae81ff></span> <span style=color:#e6db74>"</span>$file<span style=color:#e6db74>"</span> > <span style=color:#e6db74>"/tmp/</span><span style=color:#66d9ef>$(</span>basename <span style=color:#e6db74>"</span>$file<span style=color:#e6db74>"</span><span style=color:#66d9ef>)</span><span style=color:#e6db74>"</span>
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</span></span><span style=display:flex><span> <span style=color:#66d9ef>if</span> <span style=color:#f92672>[[</span> -s <span style=color:#e6db74>"/tmp/</span><span style=color:#66d9ef>$(</span>basename <span style=color:#e6db74>"</span>$file<span style=color:#e6db74>"</span><span style=color:#66d9ef>)</span><span style=color:#e6db74>"</span> <span style=color:#f92672>]]</span>; <span style=color:#66d9ef>then</span>
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</span></span><span style=display:flex><span> chmod <span style=color:#ae81ff>600</span> <span style=color:#e6db74>"/tmp/</span><span style=color:#66d9ef>$(</span>basename <span style=color:#e6db74>"</span>$file<span style=color:#e6db74>"</span><span style=color:#66d9ef>)</span><span style=color:#e6db74>"</span>
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</span></span><span style=display:flex><span> chown vmail:vmail <span style=color:#e6db74>"/tmp/</span><span style=color:#66d9ef>$(</span>basename <span style=color:#e6db74>"</span>$file<span style=color:#e6db74>"</span><span style=color:#66d9ef>)</span><span style=color:#e6db74>"</span>
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</span></span><span style=display:flex><span> mv <span style=color:#e6db74>"/tmp/</span><span style=color:#66d9ef>$(</span>basename <span style=color:#e6db74>"</span>$file<span style=color:#e6db74>"</span><span style=color:#66d9ef>)</span><span style=color:#e6db74>"</span> <span style=color:#e6db74>"</span>$file<span style=color:#e6db74>"</span>
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</span></span><span style=display:flex><span> <span style=color:#66d9ef>else</span>
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</span></span><span style=display:flex><span> rm <span style=color:#e6db74>"/tmp/</span><span style=color:#66d9ef>$(</span>basename <span style=color:#e6db74>"</span>$file<span style=color:#e6db74>"</span><span style=color:#66d9ef>)</span><span style=color:#e6db74>"</span>
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</span></span><span style=display:flex><span> <span style=color:#66d9ef>fi</span>
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</span></span><span style=display:flex><span><span style=color:#66d9ef>fi</span>
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</span></span><span style=display:flex><span><span style=color:#66d9ef>done</span>
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</span></span></code></pre></div></div><small>Data pubblicazione : 2022-07-08</small> | <small>Ultima modifica : 2022-07-08</small><p><small><a href=/categories/soluzioni/>Soluzioni</a> |
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<a href=/tags/security/>Security</a>
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<a href=/tags/server/>Server</a>
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<a href=/tags/privacy/>Privacy</a>
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<a href=/tags/dovecot/>Dovecot</a></small></p></div><section class="col s12 m3 l3 text-center blogsidebar"><div class=tags><h4 class=text-center>Tags</h4><small><a href=/tags/custom-cms/>Custom CMS</a>
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<a href=/tags/database/>Database</a>
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<a href=/tags/desktop-application/>Desktop Application</a>
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<a href=/tags/dovecot/>Dovecot</a>
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<a href=/tags/e-commerce/>E-Commerce</a>
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<a href=/tags/file-server/>File Server</a>
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<a href=/tags/web-application/>Web Application</a></small></div><div class="row articles"><h4 class=text-center>Ultimi articoli</h4><div class="col s12 m12 l12 article" style=text-align:center><div class=article-wrapper><a href=https://speedtech.it/blog/automazione-casa-con-home-assistant/><img class=img-fluid src=/images/blog/home-assistant_hud8587ebef75f9af2ca0bbe5f5b19dc45_61256_200x0_resize_q75_box.jpg width=200 height=142 alt="Automazione casa con Home Assistant" class=img-fluid title="Automazione casa con Home Assistant"></a><div class=caption style=max-width:250px;margin:auto><div class=caption-text><a class=text-title style=font-weight:400;font-size:14px href=https://speedtech.it/blog/automazione-casa-con-home-assistant/>Automazione casa con Home Assistant</a></div><div class=caption-bg></div></div></div></div><div class="col s12 m12 l12 article" style=text-align:center><div class=article-wrapper><a href=https://speedtech.it/blog/brainminder-intro/><img class=img-fluid src=/images/blog/brainminder_hu1e83e6fcbe10acdd81c6d0d0e9901bac_73079_200x0_resize_box_3.png width=200 height=123 alt="BrainMinder - second brain web application" class=img-fluid title="BrainMinder - second brain web application"></a><div class=caption style=max-width:250px;margin:auto><div class=caption-text><a class=text-title style=font-weight:400;font-size:14px href=https://speedtech.it/blog/brainminder-intro/>BrainMinder - second brain web application</a></div><div class=caption-bg></div></div></div></div><div class="col s12 m12 l12 article" style=text-align:center><div class=article-wrapper><a href=https://speedtech.it/blog/wmtrento-spreadsheet-sync/><img class=img-fluid src=/images/project/wmtrento-jspreadsheet_hu80e88a9b53e97bd051be5a21f49c7525_29205_200x0_resize_q75_box.jpg width=200 height=123 alt="Applicazione web con funzionalità di foglio di calcolo e sincronizzazione" class=img-fluid title="Applicazione web con funzionalità di foglio di calcolo e sincronizzazione"></a><div class=caption style=max-width:250px;margin:auto><div class=caption-text><a class=text-title style=font-weight:400;font-size:14px href=https://speedtech.it/blog/wmtrento-spreadsheet-sync/>Applicazione web con funzionalità di foglio di calcolo e sincronizzazione</a></div><div class=caption-bg></div></div></div></div><div class="col s12 m12 l12 article" style=text-align:center><div class=article-wrapper><a href=https://speedtech.it/blog/postgresql-database-link/><img class=img-fluid src=/images/blog/postgresql_hu0d75c994c55fb1d165504c57f70131c4_34984_200x0_resize_q75_box.jpg width=200 height=142 alt="Database link con PostgreSQL" class=img-fluid title="Database link con PostgreSQL"></a><div class=caption style=max-width:250px;margin:auto><div class=caption-text><a class=text-title style=font-weight:400;font-size:14px href=https://speedtech.it/blog/postgresql-database-link/>Database link con PostgreSQL</a></div><div class=caption-bg></div></div></div></div></div></section></div></div></div><footer><div class="row container menu"><div class="col m3 l3"><h4>Sviluppo e integrazione software</h4><ul><li><a href=/servizio/sviluppo-applicazioni/>Applicazioni web</a></li><li><a href=/servizio/sviluppo-applicazioni/>Applicazioni desktop</a></li><li><a href=/servizio/sviluppo-applicazioni/>Applicazioni per mobile (PWA)</a></li><li><a href=/servizio/siti-web-cms-personalizzati/>Siti web multilingua statici e dinamici</a></li><li><a href=/servizio/siti-web-cms-personalizzati/>CMS personalizzati</a></li><li><a href=/servizio/soluzioni-e-commerce/>E-commerce</a></li></ul></div><div class="col m3 l3"><h4>Comunicazione e collaborazione</h4><ul><li><a href=/servizio/e-mail-privata/>Email privata</a></li><li><a href=/servizio/e-mail-privata/>GPG per email</a></li><li><a href=/servizio/soluzioni-collaborazione-online-offline/>Nextcloud</a></li><li><a href=/servizio/soluzioni-collaborazione-online-offline/>TrueNAS</a></li><li><a href=/servizio/soluzioni-collaborazione-online-offline/>Seafile</a></li><li><a href=/servizio/servers-linux-gestiti/>Servers con Linux</a></li></ul></div><div class="col m3 l3"><h4>Sicurezza</h4><ul><li><a href=/servizio/sicurezza-firewalls-vpn/>Firewall OpnSense</a></li><li><a href=/servizio/sicurezza-firewalls-vpn/>Password manager Vaultwarden</a></li><li><a href=/servizio/sicurezza-firewalls-vpn/>VPN con Wireguard</a></li><li><a href=/servizio/sicurezza-firewalls-vpn/>VPN con Fritz!Box</a></li><li><a href=/servizio/sicurezza-firewalls-vpn/>Cifratura dati</a></li><li><a href=/servizio/sicurezza-firewalls-vpn/>Backup in Cloud</a></li><li><a href=/servizio/sicurezza-firewalls-vpn/>Protezione da ransomware</a></li></ul></div><div class="col m3 l3"><h4>Domotica open source</h4><ul><li><a href=/servizio/domotica-opensource/>HomeAssistant</a></li><li><a href=/servizio/domotica-opensource/>Tasmota</a></li><li><a href=/servizio/domotica-opensource/>Integrazione con dispositivi Shelly</a></li><li><a href=/servizio/domotica-opensource/>Integrazione con dispositivi Sonoff</a></li></ul></div></div><div class="row container"><div class="col m4 l4 footer-contact-details"><p>SpeedTech di Gerola Ing. Roberto</p><p>VAT ID : IT02446960227</p><p>REA : TN - 225335</p><p class=copyright>2001-2024</p></div><div class="col m4 l4 footer-contact-details" id=contact><p><span class=footer-title><i class="icon icon-phone"></i>Telefono : </span><a href=tel:+390464414131 title="Telephone contact">+39 0464 414131</a></p><p><span class=footer-title><i class="icon icon-email"></i>Email : </span><a href=mailto:%72%6f%62%65%72%74%6f%40%73%70%65%65%64%74%65%63%68%2e%69%74>Invia una email</a></p><h4 style=margin-top:20px><i class="icon icon-location"></i>Indirizzo</h4><p>Viale Trento, 31<br>IT-38068 Rovereto (TN) ITALY</p></div><div class="col m4 l4 footer-contact-details"><h4 style=margin-top:20px><i class="icon icon-link"></i>Links</h4><p><i class="icon icon-git"></i> <a href=https://forgejo.speedtech.it/explore/repos>Git code repository</a></p><p><img alt=BrainMinder style=width:32px;vertical-align:middle src=https://brainminder.it/brainminder-icon.svg><a href=https://brainminder.it>BrainMinder</a></p></div></div></footer></body></html> |