[Swan-dev] google is marking libreswan e-mail as spam

[D. Hugh Redelmeier]

I don't know if this is the cause, but lots of mailing lists have been
forced to rewrite some addresses address.  It seems that Google and
perhaps Microsoft and other big guys have decided that forwarded mail
is suspect.  DMARC or DKIM or SPF or something like it gets broken by
forwarding.

I've not read this but it might be relevent:

<https://sites.google.com/site/oauthgoog/mlistsdkim>

See this incomplete description of the gtalug mailing list reaction:
<https://gtalug.org/pipermail/talk/2016-June/003326.html>
<https://gtalug.org/pipermail/talk/2017-March/004659.html>