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Date: Sun, 14 Jun 2015 11:01:42 -0700
From: Gregory Shapiro <gshapiro@gshapiro.net>
To: Frank Seltzer <frank_s@bellsouth.net>
Cc: freebsd-stable@freebsd.org
Subject: Re: Sendmail problem after upgrade to r284296
Message-ID: <20150614180142.GE95564@minime.local>
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> # DHParameters (only required if DSA/DH is used)
> O DHParameters=/etc/mail/certs/dh.param
> 
> # DHParameters (only required if DSA/DH is used)
> O DHParameters=/etc/mail/certs/dh.param
> 
> Again, default values, no changes to the installed files made.

Try recreating those -- I'm not exactly sure where they came from.

/etc/rc.d/sendmail stop
mv /etc/mail/certs/dh.param{,~old}
openssl dhparam -out /etc/mail/certs/dh.param 2048
/etc/rc.d/sendmail start

> root@Shop:/etc/mail/certs # openssl version
> OpenSSL 1.0.1n-freebsd 11 Jun 2015

1.0.1o has the ABI fix.  From openssl.org:

12-Jun-2015:	   New releases to resolve ABI compatibility problems:
12-Jun-2015:	   OpenSSL 1.0.2c is now available, including bug fixes
12-Jun-2015:	   OpenSSL 1.0.1o is now available, including bug fixes

It was imported on HEAD in rev 284329.