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Emails getting marked as spam when sending to certain domains

Posted on 2008-06-16
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Last Modified: 2013-11-30
Experts,
We have just built a new Exim SMTP server, registered an mx record setup rDNS and a A record for our domain  but certain mail servers are marking our messages as spam...

Cant see where we are going wrong.

DNS details:
(A) mail.citizen.net.au > 203.35.237.92
(MX)  citizen.net.au > mail.citizen.net.au
(PTR) 203.35.237.92 > mail.citizen.net.au

Also im pretty sure our SMTP greetong is set to maxmailproxy.citizen.net.au - when i telnet to 25 internally i get what looks like the correct greetiog, but from external its just a bunch of ************** - which i think was done for security reasons??? does that matter?

what am i missing?
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Question by:theoaks
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Expert Comment

by:Chris Dent
ID: 21792178

Hey,

Yeah it does matter.

It suggests something like a Cisco PIX is performing ESMTP Inspection (replaces unsupported / illegal commands with ***). Disable that and you should have less of a problem getting caught as spam.

SMTP servers need to pass properly formatted banners to pass reverse checking.

HTH

Chris
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Author Comment

by:theoaks
ID: 21792246
Done removed esmtp from the pix, i am getting a greetong externally but still getting marked a spam sending to yahoo and hotmail.
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Expert Comment

by:Chris Dent
ID: 21792291

Those might take a while to think about things if you've only just changed it. They tend to cache a lot of information.

I take it you're getting the message rejected during the SMTP conversation rather than it just being dropped in Junk Mail (or whatever it's called on those two)?

Chris
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Author Comment

by:theoaks
ID: 21792308
no its not being rejected, just dropped in there spam folders.

Thanks for your help
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Expert Comment

by:Chris Dent
ID: 21792335

That's going to make it more complex then. It may improve if your server is now passing a banner correctly, but it's decisions there aren't as clear cut.

I take it the content of the message was just text, and excessively simple?

To be honest, I'd give it a couple of days and see if the matter improves. AOL, Hotmail and such all take a few days to think about things again following a change.

If it doesn't work you can raise it with each organisation individually. Hotmail have a (long) form you can fill in to work through it.

Chris
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Author Comment

by:theoaks
ID: 21792360
ok ill wait for the changesand see how that goes.

is the mx record necessary would you say? or can we get away with just a rDnS entry?
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Expert Comment

by:Chris Dent
ID: 21792492

You need the MX record if you expect to receive mail for the domain :)

RDNS is only used when you're sending out mail (when your SMTP server attempts to deliver to others).

Chris
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Author Comment

by:theoaks
ID: 21792505
Its only being used for outgoing.

Thanks
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Expert Comment

by:Chris Dent
ID: 21792519

Ahh okay, in that case you won't need the MX, although it would help for receipt of Non-Delivery Reports (if you need them).

Chris
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Author Comment

by:theoaks
ID: 21843631
Can anyone else shed any light on this... we are still getting marked as spam going to yahoo and hotmail.

Thanks
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Accepted Solution

by:
Chris Dent earned 500 total points
ID: 21844392

Start with Hotmail and see what they say:

http://postmaster.msn.com/Troubleshooting.aspx

Eventually you should get to this link:

https://support.msn.com/eform.aspx?productKey=edfsmsbl&ct=eformts

Chris
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Author Comment

by:theoaks
ID: 21864552
i have filled out the forms at yahoo and hotmail. lets see what happens
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