DokuWiki

h1. MailCow

h2. set max mail-size

taken from https://docs.mailcow.email/manual-guides/Postfix/u_e-postfix-attachment_size/

h2. Backup-Mailserver

interesting article covering that topic

https://autoize.com/backup-mx-configuration-for-mailcow/

h3. Backup

taken from https://mailcow.github.io/mailcow-dockerized-docs/b_n_r_backup/

create backup-target-location

<pre><code class="shell">

mkdir /mnt/mailcow_backups

</code></pre>

create daily-backup-script @/etc/cron.daily/mailcow_backup.sh@

<pre><code class="shell">

#!/bin/sh

# Backup mailcow data

# https://mailcow.github.io/mailcow-dockerized-docs/b_n_r_backup/

set -e

OUT="$(mktemp)"

export MAILCOW_BACKUP_LOCATION="/mnt/mailcow_backups"

SCRIPT="/opt/mailcow-dockerized/helper-scripts/backup_and_restore.sh"

PARAMETERS="backup all"

OPTIONS="--delete-days 30"

# run command

set +e

"${SCRIPT}" ${PARAMETERS} ${OPTIONS} 2>&1 > "$OUT"

RESULT=$?

if [ $RESULT -ne 0 ]

    then

            echo "${SCRIPT} ${PARAMETERS} ${OPTIONS} encounters an error:"

            echo "RESULT=$RESULT"

            echo "STDOUT / STDERR:"

            cat "$OUT"

fi

</code></pre>

h2. automatically delete mails older than in any given mailbox/folder

<pre><code class="shell">

vim /usr/local/bin/tidyup_mailbox.sh

</code></pre>

<pre><code class="shell">

#!/bin/bash

# JKE 2023-10-16

# path to mailcow-dockerized

cd /opt/mailcow-dockerized

sudo docker compose exec dovecot-mailcow doveadm expunge -u 'user@example.com' mailbox 'FromServerMail' before 2w

sudo docker compose exec dovecot-mailcow doveadm expunge -u 'user@example.com' mailbox 'FromServerMail/Crond' before 6w

sudo docker compose exec dovecot-mailcow doveadm expunge -u 'user@example.com' mailbox 'FromServerMail/Fail2Ban_2' before 5d

sudo docker compose exec dovecot-mailcow doveadm expunge -u 'user@example.com' mailbox 'FromServerMail/Logwatch' before 2w

sudo docker compose exec dovecot-mailcow doveadm expunge -u 'user@example.com' mailbox 'FromServerMail/ztrash' before 1w

</code></pre>

add this to cron

<pre><code class="shell">

vim /etc/cron.d/tidyup_mailbox

</code></pre>

<pre><code class="shell">

# JKE 2023-10-16

#

#    min  hr   dom  month dow    user    command

#    -    -    -    -     -

#    |    |    |    |     |

#    |    |    |    |     +-day of week (0-7) sunday=0 or 7

#    |    |    |    +---------month (1-12)

#    |    |    +----------------day of month (1-31)

#    |    +-----------------------hour (0-23)

#    +------------------------------min (0-59)

#

     57   23   *    *     *    root    /usr/local/bin/tidyup_mailbox.sh

</code></pre>

h2. Debug

h3. logs

in-memory logs are sometimes not enough ...

find @mailcow.conf@, start in it's directory

<pre><code class="shell">

docker compose logs

</code></pre>

h3. statistics with pflogsumm

taken from https://docs.mailcow.email/manual-guides/Postfix/u_e-postfix-pflogsumm/

<pre><code class="shell">

docker logs --since 24h $(docker ps -qf name=postfix-mailcow) | pflogsumm

</code></pre>

<pre><code class="shell">

# JKE 2024-06-11

#

#    min  hr   dom  month dow    user    command

#    -    -    -    -     -

#    |    |    |    |     |

#    |    |    |    |     +-day of week (0-7) sunday=0 or 7

#    |    |    |    +---------month (1-12)

#    |    |    +----------------day of month (1-31)

#    |    +-----------------------hour (0-23)

#    +------------------------------min (0-59)

#

     59   23   *    *     *    root    docker logs --since 24h $(docker ps -qf name=postfix-mailcow) | /usr/sbin/pflogsumm -d today | mail -s "Postfix Report of $(date)" postmaster@example.com

</code></pre>