This site will have limited functionality while we undergo maintenance to improve your experience. If an article doesn't solve your issue and you want to ask a question, we have our support community waiting to help you at @FirefoxSupport on Twitter and/r/firefox on Reddit.

Avatar for Username

Search Support

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More

This thread was archived. Please ask a new question if you need help.

Thunderbird unable to access Optonline mail sever after latest update

  • 1 reply
  • 0 have this problem
  • 1 view
  • Last reply by bduty2

bduty2
bduty2
more options

Immediately after the latest Thunderbird update, I was unable to access the Optonline mail server. I get an error message "Sending of username did not succeed. Mail server mail.optonline.net responded: AUTH CRAM-MD5 not supported." I made no changes to Thunderbird since the last time it was working.

Immediately after the latest Thunderbird update, I was unable to access the Optonline mail server. I get an error message "Sending of username did not succeed. Mail server mail.optonline.net responded: AUTH CRAM-MD5 not supported." I made no changes to Thunderbird since the last time it was working.

All Replies (1)

bduty2
bduty2 Question owner
more options

This was fixed by using the following: Recommended POP server mail.optimum.net on 995, SSL/TLS, authentication = normal password