Graphviz Digraph Beschreibung:

digraph G
{
  label="E-Mail Architektur";
  graph [ outputorder=edgesfirst compound=true ];
  node [ shape=record color=azure4 fillcolor=white style=filled fontsize=10 ];
  edge [ style=filled splines=compound fontsize=8 ];
  rankdir=TB;

subgraph cluster1
  {
    rankdir=LR;
    label="E-Mail Client 1\nMUA";

subgraph cluster111
    {
      label="SMTP Clients";
      smtpmailer1 [ label="{ <f0> Outlook | <f1> Thunderbird }" ];
    }
    subgraph cluster112
    {
      label="Webmailer";
      webmailer1  [ label="{ <f0> Squirrel\nMail | <f1> Roundcube }" ];
    }
  }

subgraph cluster11
  { 
    rankdir=LR;
    label="E-Mail Client 2\nMUA";

subgraph cluster1111
    {
      label="SMTP Clients";
      smtpmailer2 [ label="{ <f0> Outlook | <f1> Thunderbird }" ];
    }
    subgraph cluster1112
    {
      label="Webmailer";
      webmailer2  [ label="{ <f0> Squirrel\nMail | <f1> Roundcube }" ];
    }

}

subgraph cluster2
  {
    rankdir=TB;
    label="E-Mail Server 1";
    imapserver1 [shape=box label="IMAP Server\nDovecot"];
    mailbox1    [shape=folder label="Mailbox\nmaildir"];
    mda1        [shape=box label="MDA\nDovecot"];
    mta1        [shape=box label="MTA\nPostfix"];
    authserver1 [shape=folder label="Authentication\nServer\nMySQL"];
  }

subgraph cluster22
  {
    rankdir=TB;
    label="E-Mail Server 2";
    imapserver2 [shape=box label="IMAP Server\nDovecot"];
    mailbox2    [shape=folder label="Mailbox\nmaildir"];
    mda2        [shape=box label="MDA\nDovecot"];
    mta2        [shape=box label="MTA\nPostfix"];
    authserver2 [shape=folder label="Authentication\nServer\nMySQL"];
  }

subgraph cluster3
  {
    rankdir=TB;
    label="Web Server 1";
    webserver1 [shape=box label="Web Server\nApache"];
  }

subgraph cluster33
  {
    rankdir=TB;
    label="Web Server 2";
    webserver2 [shape=box label="Web Server\Apache"];
  }

subgraph cluster4
  {
    rankdir=TB;
    label="Backup Server 1";
    backupserver1 [shape=box label="Backup Server"];
  }

subgraph cluster44
  {
    rankdir=TB;
    label="Backup Server 2";
    backupserver2 [shape=box label="Backup Server"];
  }
  
  // Verbindungen innerhalb des E-Mail Servers 1
  imapserver1 -> mailbox1   [ dir=both label=""             ];
  mda1 -> mailbox1          [          label=""             ];
  mda1 -> authserver1       [          label=""             ];
  mta1 -> mda1              [          label=""             ];
  mta1 -> authserver1       [          label=""             ];

// Verbindungen innerhalb des E-Mail Servers 2
  imapserver2 -> mailbox2   [ dir=both label=""             ];
  mda2 -> mailbox2          [          label=""             ];
  mda2 -> authserver2       [          label=""             ];
  mta2 -> mda2              [          label=""             ];
  mta2 -> authserver2       [          label=""             ];

// Externe Verbindungen
  mta1 -> mta2              [ dir=both label="SMTP"         ];

smtpmailer1 -> mta1       [ dir=both label="SMTP"         ];
  webserver1 -> mta1        [ dir=both label="SMTP"         ];
  webserver1 -> imapserver1 [ dir=both label="SMTP"         ];
  webmailer1 -> webserver1  [ dir=both label="HTTPS"        ];

smtpmailer2 -> mta2       [ dir=both label="SMTP"         ];
  webserver2 -> mta2        [ dir=both label="SMTP"         ];
  webserver2 -> imapserver2 [ dir=both label="SMTP"         ];
  webmailer2 -> webserver2  [ dir=both label="HTTPS"        ];

mailbox1 -> backupserver1 [          label="RSYNC"        ];
  mailbox2 -> backupserver2 [          label="RSYNC"        ];
}

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