Gmail Delivery Errors

[jtomelevage]

SYSTEM INFORMATION
Debian Linux 11
Webmin version	2.105
Virtualmin version	7.9.0
Related packages	DNS ?

Hello,
We are using google Workspace/Gsuite for email.
We are having issues delivering email to some domains such as gmail and yahoo. Using mxtoolbox everything looks good except:

Status Warning	dns	move2oregon.com	Local NS list does not match Parent NS list	 information More Info
Status Warning	dns	move2oregon.com	Name Servers are on the Same Subnet	 information More Info
Status Warning	smtp	alt3.aspmx.l.google.com	Reverse DNS does not match SMTP Banner	 information More Info
Status Warning	smtp	aspmx.l.google.com	Reverse DNS does not match SMTP Banner	 information More Info
Status Warning	smtp	alt4.aspmx.l.google.com	Reverse DNS does not match SMTP Banner	 information More Info
Status Warning	smtp	alt2.aspmx.l.google.com	Reverse DNS does not match SMTP Banner	 information More Info
Status Warning	smtp	alt1.aspmx.l.google.com	Reverse DNS does not match SMTP Banner	 information More Info

I’m not sure why this stopped working but may have correlated to google requiring DMARC or some other message that the domain owner received.

Thanks for any suggestions

[ID10T]

It is a DNS issue. Your reverse record doesn’t match the sending domain. Sometimes your provider will let you, or, make the change for you. Unless you were allocated a complete C block then you probably don’t have the ability to do this on your local DNS. Otherwise, you’re going to have to change the domain name of the server sending the mail.

[tpnsolutions]

@jtomelevage,

Please consult Google support regarding setting up DNS including.

MX Records
SPF Record
DKIM Record
DMARC Record

If, when you have the above setup correctly and are using the Gmail app to send, things should work.

*** I use Google Workspace myself ***

[jtomelevage]

@ID10T

t is a DNS issue. Your reverse record doesn’t match the sending domain. Sometimes your provider will let you, or, make the change for you. Unless you were allocated a complete C block then you probably don’t have the ability to do this on your local DNS. Otherwise, you’re going to have to change the domain name of the server sending the mail.

Thanks for the reply.

On another server we host many domains with apparently only one reverse DNS record, not one per domain. The difference on that server we use Virtualmin/postfix to manage all the different domains email.

I asked the hosting provider ssdnodes if they can add a second reverse DNS. Is that possible?

@tpnsolutions - If you check mxtoolbox you can see that all the records you mention are perfect.

[ID10T]

@jtomelevage

I asked the hosting provider ssdnodes if they can add a second reverse DNS. Is that possible?

I think @tpnsolutions solution is what you want. I didn’t realize you were hosting mail off server. My bad. So, if Gmail is actually doing the email and they don’t accept it, then they should be able to tell you why.

Your current hosting provider cannot delegate reverse for an IP that isn’t theirs.

[stefan1959]

@jtomelevage

aspmx.l.google.com Reverse DNS does not match SMTP Banner

try this tool its breaks down what’s going on.

Learn and Test DMARC

I can’t see how Google could have a reverse to match your domain, I think its maybe a warning can be ignored. @tpnsolutions if you run email heath on mxtoolbox do you get the same warning?