This short howto will show you how to set up a catchall for common required email addresses. Some mail servers are testing if mail is accepted on this addresses to detect spammymail servers. Hostmaster address can also be used for domain Trading, to check the ownership of the domain.

1. Create a file named /etc/postfix/regexp-catchall.cf with the following content:

# Catchall to comply with RFC standards
/^abuse@/         youshouldreadit@mydomain.com
virtual_alias_maps = proxy:mysql:/etc/postfix/mysql-virtual_forwardings.cf, regexp:/etc/postfix/regexp-catchall.cf