Topic: Email Domain setting issue

if the client would like to create a domain ABC.com on iredmailadmin, but it's only a MX20 or MX40 record.  Will it ok if other domain e.g. DEF.com send email to ABC.com?

## Also I want to know whether the iredmail will first check the MX record from DNS or it will directly go to the local mail box.


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