Mail relaying with NetSuite
When sending a reply to a valid “message.
It translates the headers in the original message. I sent:
From: Ian Gulliver <email@example.com> To: “George Sasson (PAA)” <messages.<msgid>@messages.netsuite.com> Cc: firstname.lastname@example.org
It internally translated this to:
From: email@example.com To: firstname.lastname@example.org Cc: email@example.com
It then passed the message to its outgoing mail program, which reparsed the headers. In this case, it means that I got two copies of the message; one from my local MTA because of the CC, and one back from NetSuite because of the CC.
prox helped me test this; it works when the CC isn’t coming back to the same host. That means it’s a valid relay method.