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It depends on your mail server. The way Exchange does this is by configuring its SMTP domain(s) as "internal relay", which basically means "try to find the recipient in this system and if it's not found route the message somewhere else", while instead the standard configuration of an "authoritative" domain is "try to find the recipient in this system and if ...


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I will give you an example based on your example : mail.com. IN A 10.10.10.10 company1.com. IN MX 10 mail.com. company2.com. IN MX 10 mail.com. company3.com. IN MX 10 mail.com.



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