Where did you install Firefox from? Help Mozilla uncover 3rd party websites that offer problematic Firefox installation by taking part in our campaign. There will be swag, and you'll be featured in our blog if you manage to report at least 10 valid reports!

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.

Email worked fine one day and not the next... Getting "mail server responded: STARTTLS first (#5.5.1).

  • 1 reply
  • 1 has this problem
  • 12 views
  • Last reply by Mr B

Mr B
Mr B
more options

Email worked fine one day and not the next... Getting "mail server responded: STARTTLS first (#5.5.1). Verify your email address is correct in your account settings and try again".

Got this error out of the blue. Was able to roll back my thunderbird version on my desktop and temporarily fix the error but that method didn't work on my laptop. Nothing changed, settings are the same on the functioning desktop and the malfunctioning laptop.

I've tried running in safe mode, no success.

Any help would be greatly appreciated.

Email worked fine one day and not the next... Getting "mail server responded: STARTTLS first (#5.5.1). Verify your email address is correct in your account settings and try again". Got this error out of the blue. Was able to roll back my thunderbird version on my desktop and temporarily fix the error but that method didn't work on my laptop. Nothing changed, settings are the same on the functioning desktop and the malfunctioning laptop. I've tried running in safe mode, no success. Any help would be greatly appreciated.

All Replies (1)

Mr B
Mr B Question owner
more options

Just switched to Outlook after 15 years with Thunderbird...