To my knowledge, you have to have a sender, but it doesn't have to be legit.
You could put junk in, like "(e-mail address removed)".
This works most of the time. I have experienced a few problems where setting
a valid sender email address corrected it. I think it depends on the mail
server you're sending from.
Want to reply to this thread or ask your own question?
You'll need to choose a username for the site, which only take a couple of moments. After that, you can post your question and our members will help you out.