DNS issue

Kerberos

Hi,

I am facing issue with my own personal email server: some senders got rejected due to non-resolvable domain names. For example:

Maillog contains following:

NOQUEUE: reject: RCPT from unknown[91.199.28.25]: 450 4.7.25 Client host rejected: cannot find your hostname, [91.199.28.25]; from=<[email protected]>...

When I do nslookup on the same machine, I get:

nslookup 91.199.28.25

** server can't find 25.28.199.91.in-addr.arpa: SERVFAIL

I don't use any DNS servers except of provided by Spectrum. Any ideas?

Lyn_T

Good evening @Kerberos

Thank you for reaching out to us in regards to your DNS issues with your personal email server. Unfortunately, this is a third party product and we would not be able to offer troubleshooting for this concern. You can try to clear the DNS cashe. If this doesn't help I recommend reaching out to the email service you are using for additional troubleshooting. - Lyn

RAIST515O

May ultimately want to setup dynamic DNS service with someone, considering your IP with Spectrum can potentially change without notice. This way you can better ensure you have a domain name that can always point back to your IP to properly route your traffic.

Asus has support for their service built into some of their routers... other brands may have a similar setup as well (if you are using your own router).

Kerberos

Yeah, I know about DDNS (setting it up right now), but the problem is in the portmone.com (3rd party domain) itself - it seems to be misconfigured - no reverse DNS at all.