I am a longtime Thunderbird user and no problems until recently.
I find I cannot send emails form one of my shaw accounts in Thunderbird and the other one is flakey - sometimes yes and sometimes no.
The settings on both are the same and no problems to receive emails - webmail works for sending.
The outgoing server is set to mail.shawcable.com - which has worked in past.
I can't seem to change to shaw.mail.ca which seems to be new server - only gives me drop downs of a few choices.
One of the choices is "account name" - shaw.mail.ca - this is available for my "account name" account and the other one, but it works for neither when I chose it. Trying to send with this, a popup asks for my password - which I give for the email account and it fails to connect with server. Thunderbird doesn't seem to allow me to insert simply "shaw.mail.ca"
I am running Thunderbird 31.1.2, which makes it up to date - this problem did not start with any change or upgrade to Thunderbird.
Thanks for any help or advice to resolve this!