This is something that is (hopefully) no longer a problem, I am just curious to know what caused it.
My husband uses Thunderbird to view mail from his Yahoo email address. About 4 days ago, he started to complain that he was receiving one email from Groupon, a UK website which sends out offers on goods, holidays etc., multiple times. The email was entitled 'Last chance to get an extra 15% off your next holiday!'. None of the rest of his emails was being downloaded any longer, but every time Thunderbird checked for mail this email came through again by itself. In the end, there were at least 30 copies of it!
Yesterday, I ran virus and malware checks and nothing was found. Today, I looked at Thunderbird and checked everything I could think of and the password etc was okay. I started Thunderbird in Safe Mode and also went into the web mail version of my husband's email account and found and deleted the offending email (of which there was only one) there. I am not quite sure which of these last two actions sorted the problem though I think it was probably the latter. Whichever it was, the problem seems to be sorted now.
I am really curious to know what could have happened here. Why would this one email keep being downloaded? And why did it prevent the rest of his mail from being downloaded into Thunderbird?
Any ideas, please?