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by vidarh 1801 days ago
Running over the public internet does not mean you rely on unknown third party mail servers. If I address a message to foo@apiendpoint.mycustomer.com, only the servers configured to handle mail for apiendpoint.mycustomer.com and my sending server is involved in the exchange. And that is if you trust MX records for this exchange rather than have the customer input the address of the receiving SMTP server directly.