If you’re sending email from any address beginning with a 65 – in 65.0.0.0/8 – it’s possible you’ll see some delivery problems.
Something appears to be broken with dnssec signatures for the reverse DNS zone, leading queries for reverse DNS to fail for anyone using a dnssec aware DNS resolver (which is almost everyone).
65.0.0.0/8 DNS issues
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ARIN has a post-mortem: http://lists.arin.net/pipermail/arin-ppml/2016-March/030726.html
[…] issue is DNSSEC related, so this will only impact receivers who use DNSSEC resolvers, but as Word To The Wise points out, this is nearly every major mail server […]