digraph mailu {
    label = "Mailu network flows";
    fontname = "arial";
    
    node [shape = record; fontname = "arial"; fontsize = 8; style = filled; color = "#d3edea";];
    splines = "compound";
    // node [shape = "box"; fontsize = "10";];
    edge [fontsize = 8; arrowsize = 0.5;];
    
    # Components
    internet [label = "Internet"; color = "red";];
    proxy [label = "Proxy (optional)"; color = "darkorange";];
    front [label="Front"; color="dodgerblue";];
    admin [label="Admin"; color="green"; fontcolor="white";];
    smtp [label="SMTP"; color="orchid";];
    redis [label="Redis"; color="turquoise";];
    antispam [label="Antispam"; color="magenta";];
    antivirus [label="Antivirus"; color="purple"; fontcolor="white";];
    imap [label="IMAP"; color="cyan";];
    webdav [label="WebDAV"; color="yellow";];
    webmail [label="Webmail"; color="darkgoldenrod";];
    fetchmail [label="Fetchmail"; color="chocolate";];
    oletools [label="Oletools"; color="limegreen";];
    fts_attachments [label="Tika"; color="sienna";];

    rankdir=LR;
    {rank=min; internet};
    // {rank=3; proxy};
    // {rank=4; front};
    // {rank=same; admin smtp redis antispam antivirus imap};
    {rank=max; fetchmail};

    # Proxy from internet

    internet -> proxy [
        color="red";
        fontcolor="red";
        label = <
        <TABLE BORDER="0" CELLBORDER="1" CELLPADDING="1">
            <TR>
                <TD>80/tcp</TD>
                <TD>443/tcp</TD>
            </TR>
            <TR>
                <TD>25/tcp</TD>
                <TD>465/tcp</TD>
            </TR>
            <TR>
                <TD>587/tcp</TD>
                <TD>110/tcp</TD>
            </TR>
            <TR>
                <TD>995/tcp</TD>
                <TD>143/tcp</TD>
            </TR>
            <TR>
                <TD>993/tcp</TD>
                <TD>4190/tcp</TD>
            </TR>
        </TABLE>
        >;
    ];

    # Front from proxy
    proxy -> front [
        color="darkorange";
        fontcolor="darkorange";
        label = <
        <TABLE BORDER="0" CELLBORDER="1" CELLPADDING="1">
            <TR>
                <TD>80/tcp</TD>
                <TD>443/tcp</TD>
            </TR>
            <TR>
                <TD>25/tcp</TD>
                <TD>465/tcp</TD>
            </TR>
            <TR>
                <TD>587/tcp</TD>
                <TD>110/tcp</TD>
            </TR>
            <TR>
                <TD>995/tcp</TD>
                <TD>143/tcp</TD>
            </TR>
            <TR>
                <TD>993/tcp</TD>
                <TD>4190/tcp</TD>
            </TR>
        </TABLE>
        >;
    ];
    
    front -> front [label = "8008/tcp"; color="dodgerblue"; fontcolor="dodgerblue";];
    front -> front [label = "8000/tcp"; color="dodgerblue"; fontcolor="dodgerblue";];
    front -> admin [label = "8080/tcp"; color="dodgerblue"; fontcolor="dodgerblue";];
    front -> imap [label = "4190/tcp"; color="dodgerblue"; fontcolor="dodgerblue";];
    front -> imap [label = "2525/tcp"; color="dodgerblue"; fontcolor="dodgerblue";];
    front -> imap [label = "143/tcp"; color="dodgerblue"; fontcolor="dodgerblue";];
    front -> imap [label = "110/tcp"; color="dodgerblue"; fontcolor="dodgerblue";];
    front -> smtp [label = "25/tcp"; color="dodgerblue"; fontcolor="dodgerblue";];
    front -> smtp [label = "10025/tcp"; color="dodgerblue"; fontcolor="dodgerblue";];
    front -> webmail [label = "80/tcp"; color="dodgerblue"; fontcolor="dodgerblue";];
    front -> antispam [label = "11334/tcp"; color="dodgerblue"; fontcolor="dodgerblue";];
    front -> webdav [label = "5232/tcp"; color="dodgerblue"; fontcolor="dodgerblue";];
    
    smtp -> admin [label = "8080/tcp"; color="orchid"; fontcolor="orchid";];
    smtp -> front [label = "2525/tcp"; color="orchid"; fontcolor="orchid";];
    smtp -> antispam [label = "11332/tcp"; color="orchid"; fontcolor="orchid";];
    
    imap -> admin [label = "8080/tcp"; color="cyan"; fontcolor="cyan";];
    imap -> antispam [label = "11334/tcp"; color="cyan"; fontcolor="cyan";];
    imap -> proxy [label = "25/tcp"; color="cyan"; fontcolor="cyan";];
    imap -> fts_attachments [label = "9998/tcp"; color="cyan"; fontcolor="cyan";];
    
    webmail -> front [label = "14190/tcp"; color="darkgoldenrod"; fontcolor="darkgoldenrod";];
    webmail -> front [label = "10025/tcp"; color="darkgoldenrod"; fontcolor="darkgoldenrod";];
    webmail -> front [label = "10143/tcp"; color="darkgoldenrod"; fontcolor="darkgoldenrod";];
    # carddav
    webmail -> proxy [label = "443/tcp"; color="darkgoldenrod"; fontcolor="darkgoldenrod";];
    
    admin -> redis [label = "6379/tcp"; color="green"; fontcolor="green";];
    admin -> front [label = "2525/tcp"; color="green"; fontcolor="green";];
    
    antispam -> redis [label = "6379/tcp"; color="magenta"; fontcolor="magenta";];
    antispam -> admin [label = "8080/tcp"; color="magenta"; fontcolor="magenta";];
    antispam -> oletools [label = "11343/tcp"; color="magenta"; fontcolor="magenta";];
    antispam -> antivirus [label = "3310/tcp"; color="magenta"; fontcolor="magenta";];
    
    fetchmail -> admin [label = "8080/tcp"; color="chocolate"; fontcolor="chocolate";];
    fetchmail -> proxy [label = "25/tcp"; color="chocolate"; fontcolor="chocolate";];
    fetchmail -> front [label = "2525/tcp"; color="chocolate"; fontcolor="chocolate";];
    #
    # those don't need internet:
    # oletools
    # fts_attachments
    # redis
}