User Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:38.0) Gecko/20100101 Firefox/38.0 Build ID: 20150525141253 Steps to reproduce: We use IIS7 on our WebServer. And starting from ~7-9 June of 2015 we can't sent SMTP emails. Otherwise - the same ports/credentials work fine with Outlook. Looks like Thunderbird have a bug somewhere. We don't change anything in IIS7 and it's works as always. Actual results: Received message: Sending of the message failed. The Outgoing server (SMTP) *** does not support the selected authentication method. Please change the 'Authentication method' in 'Account Settings | Outgoing Server (SMTP)'. *** it's our SMTP server url. Expected results: Everything must works the same as before ~7-9 June of 2015

Bug 1174159?. Does the workaround in bug 1174159 comment 1 work?

(In reply to Magnus Melin from comment #1) > Bug 1174159?. Does the workaround in bug 1174159 comment 1 work? Yes, this helps. Thank you very much! I think this can be incorporated in the next Thunderbird releases :)