Support for multiple domains from one server
I have several distinct domains and/or several subdomains that send mail from the same Exchange environment. I'd like to use mailgun as the outgoing smarthost for this system, but mailgun seems to require unique SMTP AUTH credentials for each of the unique primary domains, which means that many outbound emails will not be deliverable through this smarthost since the outgoing server doesn't support unique SMTP AUTH creds for each outgoing domain...
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