Add 'README.virtual-do-not-reply'.
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README.virtual-do-not-reply
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159
README.virtual-do-not-reply
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# ====================
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# Forward E-Mails to 'do-not-reply@..' address to (file) /dev/null
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# ====================
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# ---
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# Example for this readme:
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#
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# Create a forwarding to /dev/null for the address no-reply@cloud-01.oopen.de
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# ---
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DOMAIN=""cloud-01.oopen.de
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E_MAIL="no-reply@cloud-01.oopen.de"
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# see also:
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# https://www.postfix.org/VIRTUAL_README.html
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#
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# https://think.unblog.ch/weiterleiten-von-postfix-alias-an-dev-null/
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# https://think.unblog.ch/en/forward-postfix-alias-to-dev-null/
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#
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# https://www.serverwatch.com/guides/forwarding-a-postfix-virtual-alias-to-dev-null/
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# Notice:
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# the usual solution is to forward to (file) /dev/null. In a local-only setup you could do
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# that in /etc/aliases.
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#
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# However, if your're using Postfix virtual domains, it gets a little more complicated. With
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# virtual domains/users, you can't forward mail to a file (like /dev/null).
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# ---
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# 1. Set up an alias user 'do-not-reply'that forwards incoming e-mails to /dev/null.
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# ---
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# Add to file '/etc/aliases' a line like:
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# do-not-reply: /dev/null
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if ! $(grep -q -E "^\s*do-not-reply:" /etc/aliases 2>/devnull) ; then
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cat <<EOF >> /etc/aliases
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do-not-reply: /dev/null
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EOF
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fi
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# Renew alias database:
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#
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newaliases
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# ---
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# 2. Set up the domain (domain part of not-reply address)
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# ---
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# Create file '/etc/postfix/virtual_alias_domains' and add your domain '@cloud-01.oopen.de'
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#
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# ${DOMAIN} OK
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#
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if [[ ! -f "/etc/postfix/virtual_alias_domains" ]] ; then
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cat <<EOF >> /etc/postfix/virtual_alias_domains
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# - File: /etc/postfix/virtual_alias_domains
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# -
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# - Note:
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# - a mapping file always has two columns. In such a 'one-dimensional' mapping (list of domains)
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# - Postfix does not care about your second column. It does not even have to be 'OK', it can be
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# - anything.
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# -
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# - Example:
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# - <domain> OK
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${DOMAIN} OK
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EOF
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else
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if ! $(grep -q -E "^\s*${DOMAIN}" /etc/postfix/virtual_alias_domains 2> /dev/null) ; then
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cat <<EOF >> /etc/postfix/virtual_alias_domains
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${DOMAIN} OK
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EOF
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fi
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fi
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# Create Postfix lookup table (database file) from '/etc/postfix/virtual_alias_domains'
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#
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postmap btree:/etc/postfix/virtual_alias_domains
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# Add virtual_alias_domains to Postfix main Configuration
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#
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# ...
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# virtual_alias_domains =
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# btree:/etc/postfix/virtual_alias_domains
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# ...
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#
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if ! $(grep -q -E "^\s*virtual_alias_domains\s*=\s*btree:/etc/postfix/virtual_alias_domains" /etc/postfix/main.cf) \
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&& ! $(grep -q -E "^\s*btree:/etc/postfix/virtual_alias_domains" /etc/postfix/main.cf); then
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perl -i -n -p -e "s#^(\s*virtual_alias_domains\s*=.*)#\1\n btree:/etc/postfix/virtual_alias_domains#" /etc/postfix/main.cf
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fi
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# ---
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# 3. Set up adress mapping
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# ---
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# - Create file '/etc/postfix/virtual_alias_maps' and add your address mapping
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# -
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# - ${E_MAIL} do-not-reply
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# -
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if [[ ! -f "/etc/postfix/virtual_alias_maps" ]] ; then
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cat <<EOF >> /etc/postfix/virtual_alias_maps
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# - File: /etc/postfix/virtual_alias_maps
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# -
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# - Redirect mail for one address to one or more addresses.
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# -
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# - Example:
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# - # incomming address 'no-reply@cloud-01.oopen.de' to local 'do-not-reply' address
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# no-reply@cloud-01.oopen.de do-not-reply
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#
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${E_MAIL} do-not-reply
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EOF
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else
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if ! $(grep -q -E "^\s*${E_MAIL}" /etc/postfix/virtual_alias_maps 2> /dev/null) ; then
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cat <<EOF >> /etc/postfix/virtual_alias_maps
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${E_MAIL} do-not-reply
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EOF
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fi
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fi
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# Create Postfix lookup table (database file) from '/etc/postfix/virtual_alias_maps'
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#
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postmap btree:/etc/postfix/virtual_alias_maps
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# Add virtual_alias_maps to Postfix main Configuration
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#
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# ...
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# virtual_alias_maps =
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# btree:/etc/postfix/virtual_alias_maps
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# ...
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#
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if ! $(grep -q -E "^\s*virtual_alias_maps\s*=\s*btree:/etc/postfix/virtual_alias_maps" /etc/postfix/main.cf) \
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&& ! $(grep -q -E "^\s*btree:/etc/postfix/virtual_alias_maps" /etc/postfix/main.cf); then
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perl -i -n -p -e "s#^(\s*virtual_alias_maps\s*=.*)#\1\n btree:/etc/postfix/virtual_alias_maps#" /etc/postfix/main.cf
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fi
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# ---
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# 4. Reload Postfix
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# ---
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systemctl reload postfix
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