I have a Citadel mail server set up. I have configured the FQDN to match mine in Citadel settings like so. However, any mail sent uses my local hostname (epicpi3), and therefore gets marked as spam. I can't change this under the send mail box in Citadel, either.
127.0.0.1 localhost ::1 localhost ip6-localhost ip6-loopback ff02::1 ip6-allnodes ff02::2 ip6-allrouters 127.0.1.1 epicpi3 126.96.36.199 communalcliff.tk communalcliff