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I have a client who has a domain and wants to use two email servers:

  • Server #1: It would have the email atendimento@
  • Server #2: It would have the email comercial@

If I point the highest priority MX to "Server #1" and the lowest priority to "Server #2". Would this work?

3 Answers 3

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MX settings are by domain. In a mail server you can host multiple domain.

If your customer want to have email sent to [email protected] send to another server then it mean you have to forward those email to another domain/alias outside the scope of the first server, to be receive on another server on another alias.

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    (bonus, not worth separate answer) A single piece of mail may be addressed to, or (blind) carbon copied to, to both mailboxes at the same time - even in arbitrary order. It therefore helps to imagine the desired forwarding as a per-recipient operation, even where as a result messages are moved between servers.
    – anx
    Mar 9, 2023 at 18:17
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I don't think it would work.

Server #1 only knows the email address atendimento@, Server #2 only comercial@.

If you send an email to comercial@ Server #1 will reject the email.

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Yes, pointing the highest priority MX record to "Server #1" and the lowest priority MX record to "Server #2" should work for your client's requirement of using two email servers.

When someone sends an email to [email protected], the sender's email server will first check the MX records for your client's domain to determine where to deliver the email. If the highest priority MX record points to "Server #1," the email will be delivered to that server.

If "Server #1" is down or unavailable, the sender's email server will try to deliver the email to the next highest priority MX record. If the lowest priority MX record points to "Server #2," the email will be delivered to that server only if all other servers with higher priority are down or unavailable.

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