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Web Hosting and Cloud Computing Control Panels
Well, if your reverse DNS is indeed not working, that could cause problems with mail delivery.
Whatever your hostname is, if you type "host YOUR_IP_ADDRESS", the returned value must match the hostname Postfix is presenting.
That's what the "Reverse DNS" is -- it's likely saying that they either don't match, or that you don't have any reverse DNS setup.
Your ISP/hosting provider controls your reverse DNS, you'd need to contact them to update your reverse dns settings.
-Eric
host 67.212.79.61
I get this
Host 61.79.212.67.in-addr.arpa not found: 3(NXDOMAIN)
Okay, so that means there is no reverse DNS setup.
Your domains come from GoDaddy, but how about the actual server itself -- the provider hosting your server (who provided you the IP address) -- that's the organization that needs to create your reverse DNS records.
-Eric
<div class='quote'>it's likely saying that they either don't match</div>
I'll just add a bit of clarification that they don't need to match the hostname of the system. Any resolvable reverse lookup is fine (i.e., it doesn't need to be the same as the hostname of the system, but it does need to resolve to some name that resolves back to the IP). The "match" Eric is referring to, I assume, is the name that you get from a reverse lookup resolves back to the same IP.
e.g.:
[joe@delilah ~]$ host 70.86.4.238
238.4.86.70.in-addr.arpa domain name pointer ee.4.5646.static.theplanet.com.
[joe@delilah ~]$ host ee.4.5646.static.theplanet.com.
ee.4.5646.static.theplanet.com has address 70.86.4.238
Note that the system is sending out mail as virtualmin.com, and this isn't a problem.
But, yeah...you don't have reverse resolution. You must have it. Usually your host provides it, but sometimes they'll delegate it to your DNS server if you ask them and tell them your DNS server IP (but, since it doesn't need to be anything in particular, I would recommend you let your host provide it...but you obviously need to yell at them about not providing reverse currently).
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ok when I type host 67.212.79.61
I get this...
my domains comes from Go Daddy