We had actually some troubles last main with sending out to a domain the performs HELO checks. 

Our Exchange Server (2013) precedes me, and it transforms out that once it was originally setup the exterior FQDN for our letter server was no setup ~ above the Send Connector. I collection it come reflect our exterior mail name, mail.company.com. There"s a PTR record pointing native the dedicated IP ago to mail.company.com, for this reason as much as ns know everything is setup correctly. I send a test blog post to helocheck
abuseat.org and also it returns "***The HELO because that IP deal with 1.2.3.4 to be "mail.company.com" (valid syntax_ " which i assume means it"s good (since it"s no much longer reporting the internal FQDN together it to be before). I deserve to telnet to the FQDN and also the HELO reverted is likewise correct in ~ mail.company.com.

You are watching: Reverse dns does not match smtp banner

However, the MXToolbox SMTP examine for our domain names (company.com isn"t actually a domain that sends or receives mail externally - there"s 6 accepted domains setup that execute that - this can be where my trouble is) mirrors "Reverse DNS does not complement SMTP Banner".  every one of those domains have SPF records that suggest to mail.company.com.

Any thoughts on where I can check next? I"m not afraid to recognize that this is definitely not my area the expertise...

Thanks,

David

Edited Jul 11, 2016 at 21:31 UTC
Which that the complying with retains the information it's storing when the mechanism power is turn off?
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Chad.w

Do you send e-mail straight from her Exchange server publicly IP come the net or execute you go with a clever host? If girlfriend send from your Exchange windy IP, you should work through your ISP come make certain there is a reverse DNS entry in their zone file for her IP the resolves come the host name in your SMTP banner. 

I don"t really follow you on the "6 domains that do that" component of her question. 

If her e-mail goes with a smart host they will certainly have your PTR records set up correctly. SPF records only detail which servers or IP arrays are verified as being allowed to send e-mail for any kind of given domain. They have actually nothing to do with make reservation lookup on one IP Address. 


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dastafford

dastafford wrote:

Did you make certain the FQDN on the get Connector matches the FQDN top top the Send Connector?

Yes, showed via Powershell that they match.

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Chad.w wrote:

Do girlfriend send e-mail directly from your Exchange server public IP come the internet or execute you go with a clever host? If friend send from your Exchange windy IP, you should work through your ISP to make sure there is a reverse DNS entrance in their zone paper for your IP the resolves to the organize name in your SMTP banner. 

I don"t yes, really follow girlfriend on the "6 domain names that execute that" component of her question. 

If your e-mail goes v a smart hold they will certainly have their PTR records set up correctly. SPF documents only information which servers or IP varieties are showed as being permitted to send e-mail for any type of given domain. They have actually nothing to perform with to make reservation lookup on an IP Address. 

Directly, no smart hosts. Every one of our domain names have actually PTR records that point ago to mail.company.com. The 6 domain names mean us send email from this Exchange server across 6 various domain names.