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No longer able to accept self-signed certificates on SMTP connection

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  • Eyano yasuka ya NOtto

Fernando
Fernando
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Hi all,

I'm trying to configure a new account on version 78 (also tried beta) and everything is working until I try to send a message. The SMTP connection fails with the message "Sending of the message failed. / The certificate is not trusted because it is self-signed. / The configuration related to ... must be corrected".

Not sure if this has any impact, but this is an MS Exchange server and I'm connecting through port 587 with STARTTLS and "Normal Password".

On older version I had the option to accept self-signed certificates, but now I get no such option. Any idea on how to solve this in later versions?

TIA

Fernando

Hi all, I'm trying to configure a new account on version 78 (also tried beta) and everything is working until I try to send a message. The SMTP connection fails with the message "Sending of the message failed. / The certificate is not trusted because it is self-signed. / The configuration related to ... must be corrected". Not sure if this has any impact, but this is an MS Exchange server and I'm connecting through port 587 with STARTTLS and "Normal Password". On older version I had the option to accept self-signed certificates, but now I get no such option. Any idea on how to solve this in later versions? TIA Fernando

All Replies (1)

NOtto
NOtto
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Probably for older Thunderbird installations though, there are discussions and screenshots etc about how to accept any kind of certificate that is being displayed and exchanged during initial connects and handshake.

look around here e.g. <https://stackoverflow.com/questions/61077885/add-thunderbird-security-exception-for-self-signed-ssl-certificate>

although those guys seem to do SSL/TLS on 465 instead of STARTTLS which is initially plaintext first and only elevated to TLS from there, so your mileage may vary and there might be no certificate dialog or way to save it for STARTTLS mechanism? I am not really sure or can try right now.

Maybe you can as well switch over to TLS/SSL instead of STARTTLS with your mail provider or mailserver.