[CelestialTeardrop]

I have Comcast e-mail and use Thunderbird 1.5.0.12; I also have Norton Internet Security 2004.

As of June 29, I have not been able to send any e-mails containing attachments (last successful sending of an attachment was on June 17). I get a message that the mail was sent successfully but it never arrives at its destination. I have checked junk/spam mail folders, and it is not there. I also tried disabling outgoing message scanning, but it makes no difference. No attachments can be sent, regardless of file type, size, or number of attachments per e-mail.

Any ideas would be appreciated!

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What sort of attachments are they, bearing in mind most providers won't let you send executable files.
This is more likely a provider issue.

[Neil Jones]

What sort of attachments are they, bearing in mind most providers won't let you send executable files.
This is more likely a provider issue.

[CelestialTeardrop]

Hi Neil, thanks for your reply.

The attachments had the extensions .doc, .txt, .bmp, and .jpg, all of which I had successfully been able to send in the past. When I tried sending them using Comcast webmail, there was no problem. But I couldn't send them using Thunderbird. I can receive the attachments if I send them to my Comcast address from another e-mail address. So the problem is not with receiving attachments in general, just attachments sent from my Comcast address through Thunderbird.

[Neil Jones]

Try it through Outlook Express just to eliminate an issue with Thunderbird.

[CelestialTeardrop]

I just tried both Outlook Express and Outlook, and neither of them have the problem.

[CelestialTeardrop]

I just got a chance to test the issue on my computer, and it seems to have resolved itself. I'm guessing that it was a glitch over at Comcast with their spam filters, causing all attachment-containing emails with Thunderbird code to be blocked. Someone must have caught it and fixed it, and hopefully such a problem will not happen again.

Thanks for your help and suggestions, Neil!