To do this it is my understanding that I would have to have email addresses using the Fastmail domain (@fastmail.com) set up somehow in Thunderbird. I can set up my main Fastmail account email address in Thunderbird but cannot set up any others.
So far I have been unsuccessful in resolving this with Fastmail. Their support is in Australia and appears to work during business hours making turnaround for questions and responses a 24 hour process.
If anyone can tell me a) that what I want to do is not possible, or b) how to do it if it is not, I'd be very grateful for the information.


