Give the machine a hostname, put hostname.domain.tld in hostname file and DNS.
Greets, Ludi -----Ursprüngliche Nachricht----- Von: owner-postfix-us...@postfix.org <owner-postfix-us...@postfix.org> Im Auftrag von Chris Green Gesendet: Freitag, 12. Februar 2021 17:18 An: postfix-users@postfix.org Betreff: How to deal with sending mail from host isbd.uk? Just a quickie, how do I configure /etc/hostname etc. for a system at isbd.uk? It really *is* just isbd.uk:- chris$ host isbd.uk isbd.uk has address 92.243.2.29 isbd.uk mail is handled by 0 mail.vhdns.net. So, if I set /etc/hostname to isbd.uk then postfix thinks the domain name is just uk which doesn't work very well. -- Chris Green