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

[Mark Stevens]

I just ran into something similar with the latest version of TB.
I updated our SSL cert for Dovecot but TB could not access my email over 
port 993.
I clicked on file then get new messages for all accounts. TB popped up a 
warning that the cert had an invalid/incorrect hostname and if I should 
allow the exception. I allowed the exception which worked and TB is fine 
now.
I only did this because my ssl cert is a wildcard for the domain but 
does not explicitly list the hostname.


Mark

On 9/14/2022 8:23 AM, Meikel wrote:

Hello.

Am 14.09.2022 um 13:59 schrieb Christian Mack:

Sound to me, as if Thunderbird does not know the CA used to (self) sign
that server certificate.


Following the documentation at

https://community.letsencrypt.org/t/simple-guide-using-lets-encrypt-ssl-certs-with-dovecot/2921 



I configured

ssl_cert = to my Let's Encrypt SSL certificates and did a restart of Dovecont and 
at least for one installation of Thunderbird it seems to work again 
now. For the other installations I need to check later at home, but 
the problem seems to be resolved.


Regards,

Meikel

Re: Apple mail works but thunderbird unable to connect

[Mark Stevens]

make sure ports are set correctly in IPtables as it seems to be failing 
on TLS/SSL (open port 993)


Mark

On 6/22/2020 12:19 PM, Dshah wrote:

Dear all,

I am stuck on this issue for days, I am able to connect on my IMAP 
server using Apple mail client but thunderbird shows me this error: 
"improper command pipelining after EHLO"


I have tried all the ports in manual config but it just is not working 
while Apple Mail is able to connect perfectly,


here are my configuration details of "postconf -n" , "doveconf -n" and 
"master.cf "

https://pastebin.com/M3XG9DXA

Thanks in advance.