Blair Harrison wrote:
I've been seeing this on quite a lot of systems.
I think the problem lies in the two factor spam protection that Hotmail uses. They use Brightmail and also their own inhouse systems. On some occasions it appears that either an IP address or spam message is identified as spam somewhere along the line and is just getting dropped after already being accepted for delivery.
I suggest you sign up for SNDS to see some information about what your IP blocks are sending to Hotmail.
https://postmaster.live.com/snds/index.aspx
Also make sure to have a good read through all of the information on
Thanks for the links, I hadn't found them. Semi-interesting info, ultimately unhelpful though. I signed up for SNDS but there's no data for the IP, as it's sending less than 100 messages per day. In any case I can imagine what it will say - "Spam" - what I need to know is why! From reading that site it seems that Hotmail have two levels of spam filtering, so messages with a really high spam score just get deleted, and only the ones below that line make it to the user's Junk folder. They also say they have a "reputation" based weighting system, so I suspect that what is happening is all my test messages (including some volume of mail before SPF and PTR records were configured) have resulted in a poor "reputation" and now nothing can get through. -Simon -- Simon Garner Technical Director < sgarner(a)expio.co.nz mailto:sgarner(a)expio.co.nz> EXPIO Communications Ltd http://www.expio.co.nz