On 2014-10-20 05:18, Robert Moskowitz wrote:
SInce this is about mail and spam, I thought this might be a good
place to ask about nolisting:
http://en.wikipedia.org/wiki/Nolisting
I get ~ 7000 messages/day on my server, with ~70% getting tagged as spam.
I did some experimentation a few weeks ago and found that a nolisting
style "dead first MX" didn't make anywhere near as much an impact as I
hoped, while in some cases it did cause delays (although only a few lost
messages that we could find, and all from small home-grown systems that
really deserved to feed to a proper mail relay)
What does seem to still work is having a secondary/last dummy MX that
answers with 4xx, at least at this point. Based on my (definitely
unscientific) testing, I believe that dumb ratware hits the lower
priority (highest numbered) MX, smarter ratware either starts at the top
or hits them all.
For this purpose, I'm currently using junkemailfilter.com's freebie:
MX 997 mxbackup1.junkemailfilter.com.
MX 998 mxbackup2.junkemailfilter.com.
mxbackup1 is a free backup-MX service, mxbackup2 is an "always fails"
final MX. It's very clever, before accepting mail, it probes your
server. If your server is up and returns a 2xx or 4xx, it'll return a
4xx (so it won't accept mail if your server is working, thereby avoiding
the situation where a backup mail provider opens a hole in your finely
tuned filters), or if your server returns a 5xx, it will pass on the 5xx.
If your server doesn't respond, they'll 200 and accept the mail, then
forward it to your higher-numbered MX when you return.
It's a really nice package, plus they use the data they collect to
improve their service, so it's a win-win. Obviously read their policies
and ensure you're okay with part of your mail stream passing through a
third party.
--
Dave Warren
http://www.hireahit.com/
http://ca.linkedin.com/in/davejwarren
