I broke courier-imap

[Reko Turja]

>> After upgrading courier-imap, I cannot connect anymore: every time I
>> try starting TLS I get the error:
>
> I got it.
>
> It seems that for some unclear reason, courietls (or is that openssl)
> need a file dhparam, even when I am using RSA and not Diffie-Hellman...

TLS1+ EDH "forward secrecy" ciphers defined to be used with Courier in 
Couriers .conf (can default to that if no ciphers are defined) and new 
Courier brought in forward secrecy and TLS1.x support perhaps?

-Reko