Can an email delivery silently fail ever, with the sender receiving no notification whatsoever about the failed delivery?
Specifically, can silent delivery failures occur for mail sent to a Gmail account:
- From another Gmail account?
- From a non-Gmail account?
I once in a while hear some people complain about not receiving my email, especially when I follow up on the email contents with them over phone. At that point they ask me to try resending.
Doesn't the SMTP protocol guarantee email delivery, or at least a failed delivery notification to the sender?