These emails come from a no-reply address, and I get quite a few on a daily basis, so I am wondering if Thunderbird has some sort of virus protection that is preventing me from receiving them. They are not going into the junk folders or spam folders. I checked with IT on the website that sends these emails, and they said everything was okay on their end. It shows the emails going through. However, I could not receive even their test message sent from their no-reply account. BUT, when they sent it from a different account, it came through fine. So the problem seems to be with my receipt of messages from their no-reply address. This started happening on December 14. I was thinking maybe it is something in my antivirus software, which is something called Symantec Endpoint Protection (supplied by my employer), so I also tried setting up all three email accounts on a different computer. This uses Thunderbird as my email software but has a different antivirus program (Avast Free), but I am having the same problem. Lastly, I tried bypassing Thunderbird by accessing my three email accounts from the web. Still not receiving the no-reply emails. Would that mean that Firefox is also involved? Obviously, *something* on both my computers thinks these "no-reply" emails are spam or even viruses. (Yet, I am receiving spam daily from lots of other sites, go figure!!!) The only thing both computers have in common is Thunderbird and Firefox. The computer I am typing on rums WindowsXP Home with service pack 3. The other computer runs Windows7 Home. My last effort would be switching to M$ Outlook, and I really don't want to do that! Can any of you offer any help? I am sorry that I am not a geek and cannot re-program anything, but I will try very hard to understand what you are telling me. Thank you in advance. Susan