DNS Address Verification

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Jason Weir
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DNS Address Verification

Post by Jason Weir » 2004-02-03 00:01

Just another useful feature I've used with sendmail before. When accepting incoming mail the server checks to see if the "mail from:" is a valid dns domain, if not it rejects the message. Lots of spammers give bogus mail from addresses, not even using existing domains. This is something we did when I worked for the DOD and I vary rarely received any spam...

Thank for a great product..
Jason Weir

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martin
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Post by martin » 2004-02-03 20:18

Good idéa and easy to implement. Will most likley be added quite soon (like in 3.1 that will be released in a couple of weeks).

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Jason Weir
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Post by Jason Weir » 2004-02-03 20:24

3.1? Did I miss 3.0 being released?

Thanks again for a great product!!

Jason Weir

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Post by martin » 2004-02-03 20:32

Nope, you didn't miss it, but 3.0 will not include the feature since that would delay the release of 3.0 to much.. :-)

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Jason Weir
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quick brainstorm

Post by Jason Weir » 2004-02-04 20:03

everyone think about this

building on what I said regarding dns domain verification, other than the extra traffic generated why would this not be a good idea.

incoming port 25 mail - take the "mail from" address such as user@unknown.com

make a connection to unknown.com and attempt to verify the address with a "rcpt to:" command

220 (SMTP) hMailServer 2.0 2004-02-04 14:14:58
helo unknown.com
250 Hello. Pleased to meet you
mail from:postmaster@localdomain.com
250 postmaster@localdomin.com... Sender OK
rcpt to:user@unknown.com
250 OK its for user@unknown)
quit

no message is generated but the address is verified.

Jason

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Post by flashbit » 2004-04-01 12:30

In many cases that may not always verify the mail. There are lots of mailservers (Postfix default install) that let you relay the message even though the account is not there. Later on you'll receive the letter from the postmaster stating that such an account doesn't exist...

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