Avast information regarding Mail Scanner
How can I stop such error messages from occurring in Avast?
avast! has detected a secure connection from your mail program (process thunderbird.exe) to the SMTP server 188.8.131.52 (insightbb.com).
This type of connection cannot be checked for viruses. Please disable SSL/TLS in your mail client so that the Mail Scanner can scan your mail. The Mail Scanner will provide the SSL/TLS security itself.