Hi Craig,
Thank you for sharing your valuable experience. I apologize for bumping
up this slightly old thread.
> After that, the MTA needs to be able to check the DNS validity of the
> sender's SMTP HELO hostname, and check their DNS PTR record is valid,
> and both the mail's envelope and address from domains have MX records.
1) Could you please suggest some script/mechanism that performs
these DNS PTR == SMTP HELO, envelope-address-from-domains-have-MX et al
checks with OpenSMTPD as the MTA? I may be wrong here, but I could not
see options to perform these useful checks in smtpd(8)/smtpd.conf(5)
man pages. In case greyscanner does this, please disregard this
question. I came to know about greyscanner in this thread, but
struggle with understanding perl.
> A -> B -> C
> spamd -> MTA (with loads of DNS knobs) -> Dovecot (via LMTP) which writes mail to disk.
2) Is IPv6 support in spamd essential? In other words, does lack of IPv6
support in spamd hurt in terms of spam being delivered over IPv6? I may
be wrong here, but the IPv6 spamd patch has reincarnated -
https://mastodon.social/users/phessler/statuses/98912923844480209.
Unfortunately, I do not know the current state of that patch beyond
those toots by @phessler.
And in case it helps anyone, https://github.com/vedetta-com/caesonia
along with https://github.com/vedetta-com/vedetta is a useful resource.
Regards,
ab
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