Intermittent sending email- no error messages
I have been battling an intermittent email sending issue for about 3 months and here's the scenario. We are using Thunderbird version: 31.5.0 generally with no issues, then without notice we will no longer be able to send emails reliably. I have tried to copy and paste the body of the email to a new email to try to see if that will send, Nope. I am in contact with my email service provider (iPage) trying to see if it is something on their end and in doing that I tried to send the source to a separate computer via a .TXT file and that wouldn't send either. In order to get it to send the source code to the other computer I had to copy and paste it to MS-Word and save it as a .DOC file format. But if we re-type the entire email message and try to re-send it will send with out any issues. Also, the unusual thing that we are seeing is that we are getting the message that the message was sent successfully and there are no errors when the failures are occurring.
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Ok if you are being notified the message was sent, that means your providers mail server is telling Thunderbird it got the message with no errors. What it does with it after that is anybodies guess. Except of course the ipage people they have the server and logs to work it out with.
Being locked down to using DOC formats woulds like malware so it can piggy back out on the doc file. Have you run virus scans?
Or it could be that the firewall at the providers end just does not accept TXT attachments. Not all that uncommon. But you would expect them to be able to tell you exactly what their mail rules were.