Comcast SMTP / Thunderbird woes

[robertlaferla at comcast.net (Robert La Ferla)]

Bob BLU wrote:
> Are you connecting from the Comcast network (eg: your house), or from 
> a different network (eg: somewhere else)? If you are connecting from 
> somewhere else, then you probably need to authenticate before sending.
Connecting from my house from a Windows client (Thunderbird) thru a 
Linux router.  The SMTP settings on Thunderbird are set to 
smtp.comcast.net.  Maybe I need to use mail.comcast.net?  This was 
working fine up until a few weeks ago or so.