0
votes
1answer
33 views

Evaluation of mail server configuration

I have a mail server configured to use DNS real-time blacklists (DNSRBLs), e.g. zen.spamhaus.org, to determine whether delivered email is spam or not. I would like to evaluate my mail server's ...
34
votes
4answers
3k views

Is greylisting still an efficient method for preventing spam?

I've used greylisting on my servers for many years, but I don't know how effective it is nowadays. Is it still good for fighting spam in 2012? Or is the typical spammer MTA capable of resending ...
2
votes
3answers
538 views

GeoIP based greylisting with Exim?

I have been using Sendmail together with milter-greylist for many years at several sites. milter-greylist has support for defining greylisting rules based on GeoIP database lookups. This is very ...
10
votes
7answers
2k views

Does SMTP greylisting a) stop much spam and b) stop much legitimate mail?

I've just set up an SMTP server on a relatively little used domain using Postfix and enabled greylisting with SQLGrey. So far it seems to be working OK, and while there's the slight irritation of ...