Why you should use an existing email address as the sender address
In many national Email Codes, you are required to use an existing sender email address. In addition to this requirement, there is another good reason to select an existing email address as the sender address: the email could be rejected by the recipient ISP.
There will always be people who press the Reply button or a shortcut to reply, because they want to tell you something.
There are ISPs which check whether or not the sender address exists and reject any emails which have a non-existing email address as the sender.
The sender address used as reply address
Email is a medium which works both ways. Compare it to a phone call where you tell your story and then immediately hang up, quite rude, right? There will always be people who press the Reply button or a shortcut to reply, because they want to tell you something. So don’t use a “noreply@” address because it works about the same way as the phone call: you are getting across your message and at the same time indicating that an answer isn’t appreciated. Why not? Bluntly put, it lacks respect toward the recipient of your message, “I do the talking, you just listen”.
So make sure a reply gets back to your inbox. It’s fine if you send an auto-reply back in which you carefully explain which department/address the customer can contact for questions or comments on a certain subject .
Most of all, you should make sure that the sender address exists. That way you act in accordance with local email law and you won’t be confronted with rejected emails because you’re sending your newsletter from a non-existing email address.