"Sender domain must exist" error while receiving mails from certain domains.
For 'Sender domain must exist' error, we can try a workaround by adding an exception.
We can add an exception for incoming mails from certain domains for "sendercheck" attribute.
We can add an exception using the following Command,
CLI > exception add smtp:in sendercheck "domainname" off
Instead of "domainname" we can also use following options,
- IP address--exact match (implicit or explicit /32 netmask)
- IP address - most specific netmask (netmask /24 wins over /16)
- *.domainname - longest name wins (wildcard "*" refers to a subdomain)