Today my employer asked me to look into Postfix. We should take an address like root@some.obscure.host.local.lan and make it into root.some.obscure.host@domain.tld.
Looking at the (good) documentation from Postfix, I managed to get a solution. You should change in /etc/postfix/main.cf:
canonical_maps = regexp:/etc/postfix/rewrite
and the /etc/postfix/rewrite file will contain:
/^(.*)@(.*)\.local\.lan$/ ${1}.${2}@domain.tld
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