Public bug reported:

Hello,

I spent the better part of the morning trying to get the Ubuntu sendmail
package to use a 2048 DH parameters file created like this so that it
could send email to hosts that have fixed logjam already...

openssl dhparam -out /etc/mail/tls/dhparams.pem 2048 
changed sendmail.mc to define(`confDH_PARAMETERS', 
`/etc/mail/tls/dhparams.pem')dnl 
make 

in sendmail.cf it says O DHParameters=/etc/mail/tls/dhparams.pem

but no matter what I do sendmail doesn't use the new DH Parameters file.

It keeps giving this error

Sep  9 10:11:06 d3 sm-mta[10012]: STARTTLS=client, error: connect failed=-1, 
SSL_error=1, errno=0, retry=-1
Sep  9 10:11:06 d3 sm-mta[10012]: STARTTLS=client: 10012:error:14082174:SSL 
routines:SSL3_CHECK_CERT_AND_ALGORITHM:dh key too small:s3_clnt.c:3339:

** Affects: sendmail (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1493922

Title:
  sendmail package does not support strong DH/TLS

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