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[web] ASP.net Sending Mail & Spam

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Hello, A lot of our emails are being marked as spam and customers are complaining that they never get the emails they request. We had one of our clients who have X-Barracuda run a check and see what it came up with.
X-Barracuda-Spam-Score: -0.49
X-Barracuda-Spam-Status: No, SCORE=-0.49 using global scores of TAG_LEVEL=1000.0 QUARANTINE_LEVEL=1.4
KILL_LEVEL=3.0 tests=HTML_FONT_BIG, HTML_MESSAGE, MIME_HTML_ONLY MSGID_FROM_MAT_ID, NO_REAL_NAME
So from this client it looks like we were not marked as spam. I'm new to this so don't really know how we can have negitive score...or what it means...but here are our numbers from the tests
0.55 NO_REAL_NAME
0.70 MSGID_FROM_MTA_ID
0.00 HTML_MESSAGE
0.26 HTML_FONT_BIG
0.00 MIM_HTML_ONLY
I'm unsure what something like MSGID_FROM_MTA_ID means, but since that was the highest, we would like to lower that somehow. Is there anything we can do to lower some of these numbers? Thanks

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What you need to do is:

0. Get a proper reverse DNS for your MTA public IP address which has a valid forward lookup on it too***

1. Make sure you don't forge the sender address of the mails. Ensure that the domain you're using in "From" is one you're authorised to use. Make sure that the SPF record for this domain, if any, allows you.

2. Make sure your messages are valid in terms of SMTP and MIME standards. Note that MS IIS will permit you to send messages with screwed-up line endings, in contravention of the SMTP.

3. Don't share hosting with anyone. At all. Ever. You have no idea what they're sending (i.e. spam). If you share hosting, your sharers will get you blacklisted, I can guarantee it.

4. Use a decent MTA which keeps logs; have bounces go to a monitored mailbox. This will help you diagnose problems.

5. Hope you don't have customers who use AOL; AOL's spam policy is "We block mail if we feel like it; we won't tell you why or care". AOL's idiot customers mark messages as spam arbitrarily; AOL then listen to their customers and decide to take their word for it.

---

The problem with point 3 above is that you're probably using MS IIS as your MTA. It logs virtually nothing, nor has it a facility to log anything. Your only real solution is to get a non-braindead MTA.

If you find your MTA's IP address blacklisted unjustly, you can normally get removed either free of charge or for a small fee - PROVIDED YOU'RE NOT ACTUALLY SENDING SPAM!

If you are genuinely sending spam as well as legitimate messages, don't expect your non-spam messages to get through simply because they're not spam themselves - you will get blacklisted!

Mark

*** Sorry, almost forgot this, it's a bit obvious.

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