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I have a costumer which uses his ERP system to send e-mails through my Smartermail server.
He has configured a default account for his system, so all e-mails are sent from email@example.com.
But this system uses the user's address as the sending address, so the e-mail must be sent using one e-mail address (firstname.lastname@example.org) but using the logged user's e-mail address as "from address"(email@example.com).
When this happens they get this error: "550 from address must match authenticated address" and the e-mail is not sent.
I have three questions:
1. I don't remember changing anything on my server configuration, but my costumer says that his ERP has always worked this way and he started getting this error recently. I have not upgraded Smartermail recently. What could have happened? (Maybe I changed some config but I don't remember...)
2. Is there a way to allow that behavior?
3. Is it dangerous to allow it? Is there any downside to it?