* Posts by cdd-aix

1 publicly visible post • joined 19 Sep 2015

The last post: Building your own mail server, part 2


Funny, OpenBSD provides a greylister, spamd. However, the article does not mention it.

Spamd can tar pit hosts on the blacklist. Blacklisted hosts are sent to a separate dummy SMTP server that responds slowly and discards everything.

http://www.openbsd.org/spamd/ has details.

Thank you for including configuring submission protocol.

You neglected the "Why"

Many ISPs block outbound SMTP, but permit outbound submission protocol.

May I suggest a followup article.

Mail senders that do not play nice with greylisting.

There is a well loved advertising company that retries sends from EVERY host in their netblock.

There are several parcel carriers that attempt delivery only once.