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Your licensing activities are just so simple. Activate your new license, reactivate your existing license, or update your license info with the click of a button, right from the Manage License screen.
https://help.tallysolutions.com/docs/te9rel60/Error_warning_message/e-mail_messages.htm

E-Mail

This page contains some of the commonly faced error messages while working with Tally's e-mail facility.

1.    Mail Server Connection Failure

2.    Could not handshake with e-mail server

3.    Bad to Address (due to incorrect e-mail address)

4.    Authentication Failed