Feedback - This is a heads up on another reason why SMTP fails. If your 'Error Console' says something like this: > mailnews.smtp: Command failed: 535 Authentication unsuccessful [MN2PR05CA0041.namprd05.prod.outlook.com 2024-09-25T20:33:37.105Z 08DCDD14E4ECBF59]; currentAction=_actionAUTH_XOAUTH2 SmtpClient.sys.mjs:602:19 > >mailnews.smtp: Command failed: 500 Unrecognized command 'Length: 7' [MN2PR05CA0041.namprd05.prod.outlook.com 2024-09-25T20:33:42.231Z 08DCDD14E4ECBF59]; currentAction=_actionAUTHComplete SmtpClient.sys.mjs:602:19 > I asked user to check 'alias' email address. Some people may have a hotmail email address and also that hotmail account allowed some additional/alias email addresses. But to send you might need to use the primary not the alias email address. Confirm email address is primary. User Response - alias was issue - > You were correct on aliases. > I've been using www.pobox.com as an email relay to keep a common email address, even if I switch email providers. When someone sends an email to my pobox.com, it gets routed to my current email provider. In Thunderbird, I have it set up Reply-to-Address to the pobox.com email address. >However, some people were getting confused on whether my email address was hotmail.com or pobox.com, as it would show the From as hotmail.com, but when they reply, it shows pobox.com. So, I added the pobox.com as an alias and made it my primary... > >This was causing the issue, fixed when I made my hotmail.com the primary. > In this instance not caused by a bug.
Bug 1919695 Comment 35 Edit History
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Feedback - This is a heads up on another reason why SMTP fails. If your 'Error Console' says something like this: > mailnews.smtp: Command failed: 535 Authentication unsuccessful [MN2PR05CA0041.namprd05.prod.outlook.com 2024-09-25T20:33:37.105Z 08DCDD14E4ECBF59]; currentAction=_actionAUTH_XOAUTH2 SmtpClient.sys.mjs:602:19 > >mailnews.smtp: Command failed: 500 Unrecognized command 'Length: 7' [MN2PR05CA0041.namprd05.prod.outlook.com 2024-09-25T20:33:42.231Z 08DCDD14E4ECBF59]; currentAction=_actionAUTHComplete SmtpClient.sys.mjs:602:19 > I asked user to check 'alias' email address. Some people may have a hotmail email address and also that hotmail account allowed some additional/alias email addresses. But to send you might need to use the primary not the alias email address. Confirm email address is primary. User Response - alias was issue - > You were correct on aliases. > I've been using www.pobox.com as an email relay to keep a common email address, even if I switch email providers. When someone sends an email to my pobox.com, it gets routed to my current email provider. In Thunderbird, I have it set up Reply-to-Address to the pobox.com email address. >However, some people were getting confused on whether my email address was hotmail.com or pobox.com, as it would show the From as hotmail.com, but when they reply, it shows pobox.com. So, I added the pobox.com as an alias and made it my primary... > >This was causing the issue, fixed when I made my hotmail.com the primary. > https://support.mozilla.org/en-US/questions/1451659?page=4#answer-1680355 In this instance not caused by a bug.