All other accounts (Gmail, Yahoo, Hotmail/Live) work in Tbird with avast! inbound scan enabled; only Verizon is affected.
I've tried the various expert settings in the mail shield, including adding incoming.yahoo.verizon.net to the SSL account list @ no encryption. I've tried various settings in Tbird as well.
The only way to login to my Verizon accounts in Tbird is by disabling avast! inbound message scan.
Suggestions? Something I'm overlooking or just an issue with avast?