I've done some sniffing around, and it looks like we could at least start 
figuring out *why* we're getting on this spamhaus list if we would enable DMARC 
in notify-only mode, and it would definitely help our IP reputation to have an 
SPF record. So I think we should configure the following DNS entries:


# We could probably also put "a mx" in here to allow the A and MX
# records for mercurial-scm.org to transact mail.
mercurial-scm.org.  IN TXT "v=spf1 ip4:192.81.134.36 
ip6:2600:3c01::f03c:91ff:fedb:76b6/64 ~all"


# rua = "aggregate data reporting address"
# ruf = "forensic data reporting address"
# fo = "failure option" -> 1 means "report for any failure"
# By default this applies to 100% of mail.
_dmarc.mercurial-scm.org. IN TXT "v=DMARC1; p=none; 
rua=mailto:dm...@mercurial-scm.org; ruf=mailto:dm...@mercurial-scm.org; fo=1"



and configure dmarc@ to forward to someplace private, but reachable by the 
sysadmin group. Thoughts?
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