I think some mail servers verify the RDNS against the stated HELO and some just verify
that the RDNS exists. There are different
variations and you would need to check each server to find out what it does and
doesn't check.
Sorry I can't help a bit more on this.
Regards,
Howie
----- Original Message -----
From: "Matthew Boyce" <[EMAIL PROTECTED]>
To: "inFusion Support List" <[EMAIL PROTECTED]>
Sent: Wednesday, January 16, 2002 12:50 PM
Subject: RE: [iMS] qualified host name issue
> First of all thank you to Howie and Len.
>
> Our system has the ability to send email via 3 methods:
> 1. Static
> -no dynamic content (no parsing of message)
> -use IMS POST to POST messages to recipient's email server
> 2. Dynamic
> -use dynamic content (using cfx_imsmail tag) to parse headers for dynamic
> content and CFLOOP to create the personalized content (incredibly slow
> <8,000 messages per hour)
> -use IMS POST to POST messages to recipient's email server
> 3. Direct
> -use dynamic content (our proprietary cf code to make .msg and .mail files
> and spread them across our 3 clustered servers)
> -we developed this, because it was a quick way to make dynamic emails
> faster than the cfx_imsmail tag. we can create and send upwards of 350,000
> 10-20k messages per hour with completely dynamic/personalized content with
> tracking urls for open ratios and click ratios, etc. cfx_imsmail tag (2.2
> at the time) just could not do what we needed it to do quick enough.
> -use IMS POST to POST messages to recipient's email server
>
> What we did not do is set the HostName in our 'Direct' method properly. It
> was hardcoded to the primary server HostName, but then showing the IP
> address for the machine in the cluster that actually POSTs the mail. When
> comparing the IP with the HostName that was hardcoded is where we having
> been running into issues. We have now updated the code to insert the
> HostName of the actual server the message is being POSTed from.
>
> My question is in the use of MX records with the POSTing method of sending
> email. If the receiving organization does a lookup comparing the IP and
> HostName in the header, they will find the name and IP match. Where does
> the MX record for this come in? Are they looking for the actual MX record
> for the root domain? For the sending server or the named sender's email
> address? Or, for the specific server that is POSTing the email? I would
> think the first version, but I have been wrong before (and funny... will be
> again too). We use specific servers for POSTing email only and not as fully
> qualified send and receive email servers.
>
> Thoughts? Help?
>
> MB
>
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