I have just up-dated to ubuntu 10.4 without any apparent problems until I tried to send an E-mail using Thunderbird.It refused to send it "unable to authenticate SMTP server. (SMTP-AUTH),You have chosen to use authentication. 'untick Use name & password'" I have never used that sort of thing and I cannot find anything to un-tick. My server settings show --connection security--none and use secure authentication as not ticked.
I can only suppose that the Ubuntu up-date has upset something---can anyone advise and help.
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