My exim4 mail server sends notification using the wrong extension, I mean:

Mail Delivery System <Mailer-Daemon@mydomain.err>

This server is a multi-domain server and mydomain.err is one of managed domains but not the main one. I would like to set the main domain and the daemon address but I cannot find it in the configuration, I did a grep in all exim configuration looking for mydomain.err and I find it only here:


Where can I change the daemon address and the main domain?


The variable you want is qualify_domain. Depending on your configuration this may be read from /etc/mailname.

  • I found this note: If MAIN_PRIMARY_HOSTNAME_AS_QUALIFY_DOMAIN is defined, the primary # hostname is used. If not, but MAIN_QUALIFY_DOMAIN is set, the value # of MAIN_QUALIFY_DOMAIN is used. If both macros are not defined, # the first line of /etc/mailname is used. – Tobia Sep 27 '16 at 15:27

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