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Mon, Oct 24, 2016 10:10 pm

Outlook 2010 0x800CCC91 error - plaintext authentication disallowed

A user who uses Microsoft Office Professional Plus 2010 as his email client reported that he could no longer download email. Whenever the user would check his email, a window would appear prompting him to re-enter his userid and password. Even after I reset his password on the server, the same thing kept happening. At the bottom, right-hand corner of the Outlook window, I saw a "Send/Receive error" messsage next to a yellow triangle with an exclamation mark within it.

Outlook 2010 send receive error

When I clicked on that error message, I saw "reported error (0x800CCC91): 'Your e-mail server rejected your user name. Verify your user name for this account in Account Settings. The server responded -ERR [AUTH] Plaintext authentication disallowed on non-secure (SSL/TLS) connections.'"

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[/network/email/clients/outlook/2010] permanent link

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