Have I a problem with Norton, Thunderbird or Yahoo

Since adding another user account yesterday to my Windows 7 HP desktop, any mail I try to send ( from either account ) brings up a Norton dialogue saying" 554 transaction failed due to possible abuse" and takes me to postmaster.yahoo.com/abuse_smtp.html

No incoming emails are affected.

If I send the same message from Windows live mail or log into BTYahoo mail, the message sends without problem.

Is it Thunderbird or Norton?? Would welcome any assistance

Welcome,

Sounds much more like a problem with email. The messages are 'pass thrus' from the IPS email server.

Are you using the same server for all of these messages?

Thanks

Hi Dick,

 

In looking at the Thunderbird forum it seems a lot of people have had the same problem in the last few hours, most of them with Yahoo. The server we use is mail.btinternet.com