Setup Multiple SMTP Servers

– Add SPF record for both SMTP servers that are authorized to send email for domain.
– Set up A and PTR records for both SMTP server sending email for
– Verify that MX records for only point to our external email provider. Inbound email should not be going straight to the onsite SMTP server.
– SMTP server must send out with reply to addresses that are valid so that replies are sent to legitimate recipients at our external email provider.

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