Outlook 2007 with Error 80040201

1250 pts.
Tags:
Hotmail
Microsoft Outlook
Microsoft Outlook 2007
Outlook 2007 error messages
POP3
Sending mail fails with a 80040201 error. Receiving mail (from Hotmail using POP3) works fine. By the way, password must be 16 characters or less. The Information Store Viewer utility (MDBVU32) does not show a Read Receipt waiting to be sent. Any other ideas?

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Your outlook profile got corrupted. First make a backup of your email in a PST file. Then in Control Panel -> Mail. Click on the profiles button. Delete your current profile and create a new one.

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Is this a newly created profile or an existing one that used to work and now does not? Try starting outlook in safe mode. (start, run, type outlook /safe). If that works you may have some problematic add-ins. Disable them all and re-enable them one by one until you find the culprit.
~ technochic

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And in the end …
Outbound (SMTP) mail settings had been “port 25 with no encryption”. That failed with the ambiguous error code. Setting SMTP to use port 587 and TLS seems to have resolved that.

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  • mshen
    ISPs often block port 25 for security reasons. Thanks for the resolution.
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