LuiLui77
asked on
SMTP Reverse DNS Mismatch
Hello All,
I am currently running a Hybrid setup with Office 365 and my on premises Exchange server 2007.
Almost all of our Mailboxes have been migrated to the Office 365 but my MX is still pointing to my On Premises Exchange server 2007.
Today I went to MXtoolbox.com just to check on my status and found out that I have a SMTP Reverse DNS Mismatch which can cause some issues on incoming and outgoing emails to external companies.
The message says: "Warning - Reverse DNS does not match SMTP Banner"
Does this pertains to my PTR record?
I am currently running a Hybrid setup with Office 365 and my on premises Exchange server 2007.
Almost all of our Mailboxes have been migrated to the Office 365 but my MX is still pointing to my On Premises Exchange server 2007.
Today I went to MXtoolbox.com just to check on my status and found out that I have a SMTP Reverse DNS Mismatch which can cause some issues on incoming and outgoing emails to external companies.
The message says: "Warning - Reverse DNS does not match SMTP Banner"
Does this pertains to my PTR record?
Are you having issue with sending emails out?
In my case Comcast emails were bouncing back, not always, but 50% of the time, and creating the PTR record on ISP side resolved the issue.
In my case Comcast emails were bouncing back, not always, but 50% of the time, and creating the PTR record on ISP side resolved the issue.
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Thanks for your responses.
Sembee, great explanation on your blog. Will this be the case with Exchange 2013 as well?
I have another Exchange 2013 in house used for Line of Business applications (different FQDN and domain). This box is running in coexistence with my Exchange server 2007. When I perform a SMTP test I get the same Mismatch message.
If this is not the case, I guess that by changing my receive connector to the same FQDN of my send connector will do.
Tell me what you think.
Sembee, great explanation on your blog. Will this be the case with Exchange 2013 as well?
I have another Exchange 2013 in house used for Line of Business applications (different FQDN and domain). This box is running in coexistence with my Exchange server 2007. When I perform a SMTP test I get the same Mismatch message.
If this is not the case, I guess that by changing my receive connector to the same FQDN of my send connector will do.
Tell me what you think.
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Ignore that "error".
I have outlined why in my blog here:
http://blog.sembee.co.uk/post/Exchange-2007-and-SMTP-Banner-Tests.aspx
Basically they are connecting to your incoming connector when the SMTP banner only applies to you outbound, which is on the Send Connector.
Simon.