Rated 2 out of 5 stars

the net-Signature of posteo.de is also refused by this Add-On. This is not very helpfully since there is no possibility to accept it anyway!

When I am giving: https://mail.posteo.de
Security State: Insecure

SSL Certificate Information:

Issued To:
Common name (CN): posteo.de
Organization (O): Posteo e.K.
Organizational Unit (OU):

Issued By:
Common name (CN): GeoTrust EV RSA CA 2018
Organization (O): undefined
Organizational Unit (OU): undefined

Details:
MD5 fingerprint: undefined
SHA1 fingerprint: AC:9D:4C:F6:36:78:FE:D6:EB:5C:CE:F9:DA:CB:69:CE:0A:93:F4:58
SHA256 fingerprint: FB:28:42:1E:23:AD:8A:23:8B:AB:C1:ED:FD:86:FD:F5:30:C6:D9:35:E0:E6:D8:91:CD:F3:77:66:05:C5:75:33
Valid from: Fr 29 Dez 2017 00:00:00 CET
Valid until: Di 22 Jan 2019 12:00:00 CET

Why You dont use the automatic routine of Thunderbird?

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And I have NO option to accept it anyway!

This review is for a previous version of the add-on (5.1). 

Thank you for trying my extension.

I have been working on improving the SSL certificate handling done by my extension and this has taken longer than I wanted. The next version (Version 6.0) will include the ability to add a security exception for SSL certificates as I have now managed to connect to the built in Mozilla certificate routines.

Thank you.