Thunderbird can't connect to Dovecot (bad certificate: SSL alert number 42)

[PGNet Dev]

> cert had an invalid/incorrect hostname 


fyi,

	https://kb.mozillazine.org/Files_and_folders_in_the_profile_-_Thunderbird
		...
		cert_override.txt
			This is an optional file used to store a security exception. It appears to store the host name , thus preventing you from creating a security exception for a rotating SMTP server.
		...

for ref,

	Firefox: How to audit & reset the list of trusted servers/CAs
	 https://access.redhat.com/solutions/1549043