The list of BCC’ed recipients is not included with emails, so there is no way of determining if or who else the email was sent to.
Email can bounce for many reasons. I’ll look at several of the most common mail bounce messages, and try to interpret what they really mean.
Spam filters can be incredibly sophisticated or very simple. I’ll look at some of the characteristics of email that spam filters can check.
Computers use email addresses to route email. Angle brackets are used when a more human-readable name is also included.
It’s unlikely that you’ve been hacked. It’s possible that your friends have both been hacked, but this kind of thing can happen without anyone being hacked at all!
It’s unlikely, maybe impossible. I’ll walk you through why that is, and one way you might get lucky.
So much information in email can be spoofed that it’s difficult to prove where an email came from unless you look at the headers.
Many websites ask you type your email address in twice for a reason: there’s a high percentage of people who cannot type their email address in correctly once.
This is a frustrating situation that happens regularly to businesses running email lists. More than likely someone on your list is automatically forwarding. There is one way you may be able to track down the source.
Spammers use many techniques to try and slide their garbage into your inbox. BCCing you on messages is one such way.