Are you saying Shaw are unable to tell you why they classified a specific email as Spam. What rot, either the peon is incompetent or lazy.

With a reason you have something to work with. As it stands your ask us to guess what it is that Shaw font like.

When you send an email using Thunderbird, it is using the smtp server of Telus which is entirely different from Telus webmail.

Suggest you check the content and subject of the emails you are sending to see if it contains something that could be picked up as spam.

I also located this which i suggest you read: http://www.theblog.ca/shaw-telus-smtp

Are you sending using port 25 ?

Robcanuck said

All emails I send to Shaw clients are identified as spam and tagged as such or deleted. Other ISP such as gmail or yahoo are ok. If I send an email by Telus webmail to a shaw client there is no problem. Telus says the problem is with Thunderbird. Shaw says they have no issues with me as far as being on a blacklist but don't know why I am being identified as spam. I use 31.7.0 which just updated recently. I think I've had this problem for about 3-4 weeks but not sure.

Matt said

Are you saying Shaw are unable to tell you why they classified a specific email as Spam. What rot, either the peon is incompetent or lazy. With a reason you have something to work with. As it stands your ask us to guess what it is that Shaw font like.

It would appear it's not Tbird. I cannot send emails via Windows live mail without them being spammed too. Telus webmail goes through fine. So, it's my IP address. Shaw cannot tell me why even after them checking with their technical staff. I am not blacklisted. Telus cannot tell me why either. I have used ports 25, 1025 and 587 with various changed in security or none on smtp authentication. All work with other ISP but not shaw. I think the only resolution will be to change my modem which will change my IP address. That will be up to Telus to decide but I think that will be the only alternative left. I have heard of other people having the same issue with Shaw and it finally disappeared. That's right disappeared - no action by anyone because shaw could not figure out what was wrong.

You could try the info at this link to change your IP address. http://www.wikihow.com/Change-Your-IP-Address-%28Windows%29