I've got a Postfix setup that allows relays only from certain domains. I accomplish this using the relay_domains
flag in main.cf and it queries mysql to find the list of allowed domains.
relay_domains = mysql:/etc/postfix/mysql_domains.cf
I would like to add a header_checks
instruction to insert a custom header based on the result of the mysql check for relay_domains
which would show which domain was relayed through Postfix. The reason for this is that if the allowed domain is .domain.com and the recipient email address is someone@subdomain.domain.com, I'd like to know which .domain.com Postfix resolved to in the lookup.
I've got the header_checks working:
/^From:/i PREPEND X-Relay-Domain: xxx
But I'm not sure how to capture the result of the domain query and use that for the header_checks PREPEND. I could also perform another mysql lookup on header_checks
but I'd like to avoid that if possible.
Best Answer
Perhaps, you can use
check_recipient_access
from postfix.File
/etc/postfix/addheader
has content like thisIn access table, PREPEND action will add header in your email. In this case, this map will add domain parts of your recipient.