problem with thunderbird

using avast 4.6 I hav trouble with thunderbird.
when i want to send a mail avast is asking for a password and i ca’nt get thru, even using the password used for avast use.
please help

avast does not ask for your password for email ever.

Your outgoing email server is asking for your password.

I assume that in Thunderbird you have set up correctly the name of your ISP smtp server and your username. If you have, when asked enter your email account password and, if you wish, check the box for Thunderbird to remember your email account password in the future.

thank you very much.
in fact i had asked thunderbird to place a password on out going mail.
i remove this instruction and now everything is ok.