Can you check two things?
DefaultSmtpServer=127.0.0.1:7362
Do you really want/need to use this port (7362)?
Are your email accounts well configurated for that?
At present I can send from all accounts, tagging with msgtag but not being virus scanned.
You need to use 127.0.0.1 and
smtp authentication adding something like this:
user_name
#smtp_server_name and your password (or let it blank)
I can only receive britishlibrary and they are scanned in.
This is because your avast4.ini file, this is the 'default' server.
When trying to receive onetel and btinternet I get a logon box showing the server as 127.0.0.1 asking for username and password. The username displayed is the correct username plus #pop3.britishlibrary.net.
Strange, it should work for username#pop3.britishlibrary.net
I think it will be better configure all your email account for
not using avast.
After that, close your email program.
Run Mail Protection Wizard and protect all your email accounts.
Open your email program again and let us know what happened...