unlink from gmail
A long time ago my Gmail account was set up to route through my Plusnet email account so that all emails arrived together on Thunderbird. I have now set up for the Gmail emails to arrive directly in Thunderbird which means that any Gmail email is received twice. How do I disconnect the Gmails being routed through the Plusmail account without stopping the Plusnet emails arriving directly from them.
Opaite Mbohovái (1)
This is a gmail issue, not a Thunderbird one. My suggestion is to check your gmail account online and see whether you have it set to forward to plusnet. If, just cancel it.