Thunderbird does not send certain emails that have attachments
Recently (perhaps since updating to 45.1.1) some of the messages that I send never arrive at their destination. I always send a BCC to a special account, just to make sure the message truly was sent. In the last 4 days, two messages with large attachments never arrived in my special account, nor did they arrive at their destination. These were two messages with larger than average attachments (perhaps 1 Mbyte).
When I send the messages, everything appears to be OK. The progress bar goes to 99%, then it says that it has completed, and the message is moved to the sent folder. But the recipient and my special mail account never get the message. It is odd because I don't get any error message of any kind.
I have no problem sending emails without attachments. Some emails with smaller attachments also go without problems.
I know that I should send my configuration information, but I can figure out how to attach that information. I am running Windows 10 on an older computer that originally had Windows 7.
How can I verify that a message is truly sent?
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I suggest you contact you mail provider. And make sure you are not using one of those Microsoft supplied accounts that do not support BCC at all.
Thunderbird does not remove the sending dialog until the server says everything is ok. So you will need to start your tracing with the provider. What are they doping with your messages.
The other posibility is they are to large for the receiving server. This should give you a message back later from the server the message was sent to. But your provider might be just eating those messages as they confuse people. It reduces support calls if you treat your customers like mushrooms. apparently.
Matt: Thanks for your comments. My email provider is Google, in other words GMail. I just don't know how I could convince Google that the problem had anything to do with them. If I use the Google web interface, the mail works fine. I am sure they would tell me to abandon Thunderbird . . . but I really like it!
As far as the emails being too large, I am quite sure that is not the problem. I know that I can easily send attachments up to 10 MB, so even if the recipient had lower limits, the email I send to myself should have gone through.