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Thunderbird pop3 connection to Microsoft365 server now gives The RETR command did not succeed. Error retrieving a message. Mail server outlook.office365.com responded: Server Unavailable. 21

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  • 2 have this problem
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  • Last reply by DH

firefox1432
firefox1432
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The RETR command did not succeed. Error retrieving a message. Mail server outlook.office365.com responded: Server Unavailable. 21 Started yesterday evening - no changes made. Access to GMAIL still works ok. Also, SMTP still works so can send but not receive. Tried removing password and re-entering - no change. Tried lowering TLS level - no change. Tried testing the same client on another laptop which worked last time I used it - that failed in the same way. Anyone any ideas - help will be appreciated. Thanks

The RETR command did not succeed. Error retrieving a message. Mail server outlook.office365.com responded: Server Unavailable. 21 Started yesterday evening - no changes made. Access to GMAIL still works ok. Also, SMTP still works so can send but not receive. Tried removing password and re-entering - no change. Tried lowering TLS level - no change. Tried testing the same client on another laptop which worked last time I used it - that failed in the same way. Anyone any ideas - help will be appreciated. Thanks

All Replies (1)

DH
DH
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I'm having this same problem since yesterday. I tried downgrading Thunderbird to a version previous to June this year but error is still occurring:

"The RETR command did not succeed. Error retrieving a message. Mail server outlook.office365.com responded: Server Unavailable. 21"

  1. Anybody knows how to fix this error?
  2. Is this a problem with Thunderbird or is it a problem with outlook.office365.com?

Thanks