I am testing the new 7.3 version of Thunderbird and found that it will do everything nicely except send RTF files.
I receive a 421 error message that the server acknowledged and disconnected.
I increased the Avast Timeout to 300 which should give me plenty of time, but it does not.
I am comparing TB to OE because I am revamping my ME computer system.
Never said I knew everything.
