Add greylisting support about mailserver HOT 3 CLOSED

Why not, greylisting works great against spammers/bots but requires decent pre-greylisting whitelists system (work in conjunction with dnswl.org for example) to prevent false positive delays.

The smtp protocol doesn't have a standard way for greylisting servers to tell sending servers when to try again, there's no guarantee that a message will get to you in a reasonable amount of time. I'm always afraid that my password reset emails delayed until after they time out and sometimes, some forums/websites they simply aren't resent at all...

I think it might be a good idea for mid/high mailservers but not really helpful for personal/small sized servers.

I can add an external policy server to Postfix (like postgrey), disabled by default but can be activated with an environment variable like ENABLE_POSTGREY.

from mailserver.

Alright, sounds good to me.

I guess my server falls in the range of small sized servers so it may not be necessary for me to use greylisting. I never managed a mailserver without greylisting so I was kind of afraid of migrating to a new system and having my users begin receiving spams while they didn't before. I guess i'll try it without greylisting and by the time I make up my mind I could just enable it easily with an environment variable.

Thanks for considering it. So far I'm very pleased with how easy it is to setup a functioning mailserver using you image.

from mailserver.

@tidge789 It's done, you can now activate Postgrey policy server with ENABLE_POSTGREY env variable.

I will merge dev to master this week-end ;)

from mailserver.