Postfix on iMil.net

Postfix to GMail Catchall (updated… again)

Tue, 21 Dec 2021 15:52:26 +0100

The other day, my wife asked me if I could just redirect all mails going to her own domain to her GMail account. “Easy task”, foolish past-me thought, not knowing the standards you have to meet to actually forward a mail from somwhere to GMail…

I naively searched for a simple bouncing method and postfix’s virtual tables seemed perfectly fit for the task (from man virtual):

The main applications of virtual aliasing are:

       o      To redirect mail for one address to one or more addresses.

       o      To  implement  virtual  alias  domains  where  all addresses are
              aliased to addresses in other domains.

So here we go and:

Make Postfix Trigger Blacklistd on Failed Authentication

Sun, 09 Aug 2020 06:59:25 +0200

The other day, I realized that from time to time, alpine, my console mail client for about 20+ years now, would close the connection to the IMAP server because of an “error”.
Digging in the logs, I realized my server was being bruteforced for months, if not years. NetBSD being the fantastic OS it is, it actually had nearly no effect on my server’s behaviour, only those annoying connections closing from time to time.
Here’s a /var/log/maillog extract of such attacks:

Simpler postfix + dspam

Wed, 02 Mar 2016 15:52:03 +0000

I have read a shitload of overcomplicated setups to bring up a postfix / dspam SMTP + antispam server, and finally came to a much lighter and simpler configuration by basically reading documentation and real life examples. Note this is suitable for a personnal and basic environment, no database, no virtual setup. Basic stuff.

The target system is NetBSD but this short doc should apply to pretty much any UNIX / Linux.