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 ---------|---------|---------|---------|---------|---------|---------|--
