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I'm not sure this can work in general. You need some entity to forward and use the proper envelope headers for the mail to go through in the backend.
by aduitsis 6y ago
I'm not sure this can work in general. You need some entity to forward and use the proper envelope headers for the mail to go through in the backend.
- jessaustin 6y agoAn SMTP server capable of responding to a forward would also be capable of responding to the original message, and would be accessible via the MX record. The only reason I see to introduce the additional server in the middle would be because the final destination is not always online or otherwise unreliable, and even then only if the forwarding server is more forgiving than typical mail senders.