Please add SPF entries to the DNS for bugs.debian.org and configure the servers to
DKIM sign the outgoing mail.  There will be few listservers receiving mail from the
bugs server so it can be implemented with few problems.  Generally improving the
authenticity of email is a good thing.

https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=754809

I'm aware of the above bug report.  But the fact that they have to deal with DKIM on
forwarded messages is separate from the issue of signing new messages.