We are having an issue with emails. Internal mail is fine. Some external mail is coming through but some isnt. The senders recieve a timeout error.
I have the folowing email from our ISP engineers. They say when they telnet our mail server they get no responce at all! Not even a deny message. They say its our problem and i cannot find anythin wrong. I have checked all out DNS records etc. I dont see how we can be recieving external mail fine from some people but not others........help!
Our mail relay is reporting a lot of timeouts when sending mail to "nz.co.nz". A majority of Emails will timeout originally, sit in a retry queue then go through on the 2nd or 3rd attempt sometime later.
Esentially our Relay is not recieveing an intial response once it makes a connection to your Mail Server and is not sending mail till it receives one. I tried telnetting to mail.nz.co.nz. When I tried a simple HELO saatchi.co.nz I got no immediate response. After a short time I got the below response:
220 Warning: no name found in DNS for your host address 250 OK
I assume your relay is trying a reverse DNS lookup. I can confirm our DNS records are correct with no recent changes. Could you please check settings at your end.