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reverse DNS failed

I have my domain name (funsunstudio.com) at godaddy.com and have created all of my MX, SPF, & CName records. I kept their nameservers. I have my XServe G5 setup to send and recieve mail. I can recieve my mail just fine and I can send my mail to most accounts. If I try to send an e-mail to an AOL account I get the following Error Message http://postmaster.info.aol.com/errors/421dnsnr.html:

Reverse DNS lookup for your IP address is failing. AOL does require that all connecting Mail Transfer Agents have established reverse DNS.

Now I went to www.mxtoolbox.com and typed in my IP Address (12.146.245.34) and it said Reverse DNS failed. My email server is mail.funsunstudio.com Now I can send to just about any other account (only other one that I have had a problem with is roadrunner e-mails). I have a seperate IP address for my website and for my e-mail. Everything looks to be right when I do a dig on my domain as well. This was working for a couple days and then it quit working (without me touching anything).

Here is what postconf -n outputs:
command_directory = /usr/sbin
config_directory = /etc/postfix
content_filter = smtp-amavis:[127.0.0.1]:10024
daemon_directory = /usr/libexec/postfix
debug peerlevel = 2
enable serveroptions = yes
html_directory = no
inet_interfaces = all
local recipientmaps = proxy:unix:passwd.byname $alias_maps
luser_relay =
mail_owner = postfix
mailbox sizelimit = 0
mailbox_transport = cyrus
mailq_path = /usr/bin/mailq
manpage_directory = /usr/share/man
maps rbldomains =
message sizelimit = 0
mydestination = $myhostname,localhost.$mydomain,funsunstudio.com
mydomain = funsunstudio.com
mydomain_fallback = localhost
myhostname = mail.funsunstudio.com
mynetworks = 127.0.0.1/32,10.0.0.1/32,12.146.245.32/28
mynetworks_style = host
newaliases_path = /usr/bin/newaliases
queue_directory = /private/var/spool/postfix
readme_directory = /usr/share/doc/postfix
relayhost =
sample_directory = /usr/share/doc/postfix/examples
sendmail_path = /usr/sbin/sendmail
setgid_group = postdrop
smtpd clientrestrictions = permit_mynetworks reject rblclient sbl-xbl.spamhaus.org permit
smtpd tls_keyfile =
unknown local_recipient_rejectcode = 550
virtual mailboxdomains = hash:/etc/postfix/virtual_domains
virtual_transport = lmtp:unix:/var/imap/socket/lmtp

I am not an open relay and everything else is working great, I just can't seem to get this reverse DNS problem to start working again. Any help would be appreciated.

Posted on Jan 19, 2006 6:51 AM

19 replies

pterobyte

Level 6

11,098 points

Feb 8, 2006 9:45 AM in response to Marshall Merritt

Honestly, I don't see what else could be wrong.

I just tested it again. If I use your NS all is fine. If I use any other NS it doesn't resolve.
So logic dictates that your ISP doesn't forward to your NS. However, when polling your ISPs NS it correctly shows that your NS is authoritative.
This is misterious. I'll ask around and let you know.

Also you may want to post your problem on some BIND related mailing list or discussion forum. As this is not a mail server issue but clearly a DNS issue, it may be easier to find help.

UptimeJeff

Level 4

3,479 points

Feb 10, 2006 7:17 AM in response to Marshall Merritt

Marshall,

Won't AT&T just host the reverse DNS?
I've never seen an ISP that requires the client to provide their own authoritative reverse DNS.

Ask them to provide a matching forward and reverse DNS entry. The entry can be generic, it doesn't need to use your domain name. AOL just wants matching entries, it doesn't care if they match the helo command or sender's mail address.

Jeff

Feb 10, 2006 7:48 AM in response to UptimeJeff

Thanks Jeff, I just e-mailed them again to see if I can do that. They have a documentation on this and it lists 5 criteria and I meet all of them so I don't know what the problem is. I can tell you this much, AT&T has been nothing but headaches so far, and if they weren't $400 cheaper then another company around here I would switch... Thanks again.

Feb 11, 2006 12:02 PM in response to Marshall Merritt

Post on network services

reverse DNS failed