Sam Varshavchik writes:

Gerald Hopf writes:

default. If even the official courier-mta.org MX server doesn't have
this correctly enabled, I somehow doubt anyone else does... And somehow
dovecot/postfix seem to manage to have this as default without
generation special DH parameter files ?

It's two opposite philosophies. You can either try to do everything automatically and by default. But, if the default rules don't work for someone, there's little they can do.

Or, provide a knob for every setting, putting you in charge and full control of everything. You have more work to do, but you have more flexibility.

I don't know offhand why you cannot get the ciphers you want. All the moving pieces should be in place. The DH parameters should get loaded, if they exist. I'll try to do some tinkering later, myself.

Ok, here's exactly what I mean. In your esmtpd-ssl, imapd-ssl, or pop3-ssl configuration file, set the TLS_DHCERTFILE setting to the file that has your DH parameters, in PEM format. It can be the same file as the TLS_CERTFILE.

Results:

Version: TLSv1/SSLv3
Bits: 256
Cipher: DHE-RSA-AES256-SHA

Attachment: pgpYruTCphzga.pgp
Description: PGP signature

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