How do I stop that incoming mail to account A gets forwarded to account B?
When setting up Thunderbird a long time ago I had two accounts and must have put in an automated forwarding from account A to an Yahoo! account. Now I deleted the Yahoo! account (completely at Yahoo!), but everyone that sends an email to A gets an error message from Yahoo!. And I can't find any settings about that forwarding. There are no filters used.
Thanks HK
Wšykne wótegrona (1)
The only way to forward in Thunderbird is using a filter. Since you found no filters I guess you need to remember where and how you set up forwarding. It appears you did not do it in Thunderbird. The usual and most recommended way is at the email providers server using the webmail page.