> On 07/09/2023 20:46 EEST Ralph Seichter via dovecot <dovecot@dovecot.org> 
> wrote:
> 
>  
> * Aki Tuomi via dovecot:
> 
> > I updated the settings a bit on the server as well. Maybe it works
> > better now?
> 
> Yes, it does indeed:
> 
>   Sep  7 19:33:23 ra postfix/smtp[14429]: Trusted TLS connection established 
> to talvi.dovecot.org[2a04:3545:1000:720:acc1:5bff:fe5e:459]:25: TLSv1.3 with 
> cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange ECDHE (prime256v1) 
> server-signature RSA-PSS (2048 bits) server-digest SHA256 client-signature 
> ECDSA (secp384r1) client-digest SHA384
>   Sep  7 19:33:24 ra postfix/smtp[14429]: 1989FBE002A: 
> to=<dovecot-requ...@dovecot.org>, 
> relay=talvi.dovecot.org[2a04:3545:1000:720:acc1:5bff:fe5e:459]:25, delay=4.3, 
> delays=0.01/0.01/3.6/0.73, dsn=2.0.0, status=sent (250 2.0.0 Ok: queued as 
> D22D55DEF4)
> 
> Thank you, Aki. Would you be willing to share what was changed in your
> server's settings and/or certificates? I am still wondering what exactly
> caused the issue. By the way, I have reverted all TLS-related changes
> previously used for testing on my end, returning to Postfix's defaults.
> 
> -Ralph

Mostly just disabled older TLS stuff and in particular enabled TLSv1.3.

Aki
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