running smtp test on soapnut.dk
smtp:188.183.91.18 smtp
220 0xbcb75b12.cpe.ge-1-1-0-1112.hcnqu2.customer.tele.dk ESMTP Postfix
Not an open relay.
0 seconds - Good on Connection time
0.702 seconds - Good on Transaction time
OK - 188.183.91.18 resolves to
0xbcb75b12.cpe.ge-1-1-0-1112.hcnqu2.customer.tele.dk
OK - Reverse DNS matches SMTP Banner
when I change nyhostname in postfix to soapnut.dk :
220 soapnut.dk ESMTP Postfix
Not an open relay.
0 seconds - Good on Connection time
0.733 seconds - Good on Transaction time
OK - 188.183.91.18 resolves to
Warning - Reverse DNS does not match SMTP Banner
Do I set myhostname in postfix to
0xbcb75b12.cpe.ge-1-1-0-1112.hcnqu2.customer.tele.dk or to soapnut.dk ?
----- Original Message -----
From: "John WInther" <j-win...@post4.tele.dk>
To: <postfix-users@postfix.org>
Sent: Saturday, March 06, 2010 11:18 PM
Subject: Re: reverse dns fails with multiple domains
My primary concern is that some mailservers deny sending mail to my
domains
if the reverse dns lookup fails. If I set myhostname to one of my public
domains, the reply string from HELO is ok, but the reverse dns lookup
fails,
If not possible to satisfy both issues what is best configuration?.
----- Original Message -----
From: "mouss" <mo...@ml.netoyen.net>
To: <postfix-users@postfix.org>
Sent: Saturday, March 06, 2010 10:01 PM
Subject: Re: reverse dns fails with multiple domains
Stan Hoeppner a écrit :
John WInther put forth on 3/6/2010 12:57 PM:
Thanks for info, I am aware of the manual and I have previus tryed to
change the myhostname to soapnut.dk, I still got the reverse dns error.
I gave me an idear to reverse resolve the ip address registred in mx,
and the reply from that test was the dns name of my internet access.
0xbcb75b12.cpe.ge-1-1-0-1112.customer.tele.dk, when i put that in as
myhostname the reverse dns lookup reply with success.
RFC does not dictate that your forward and reverse dns names match. It
does
dictate that a domain name must be valid. Anything ending in .local is
not
valid.
I'd suggest against using
0xbcb75b12.cpe.ge-1-1-0-1112.customer.tele.dk
as your Postfix HELO name. Use a hostname based on one of your mail
domains
instead. Some sites will block SMTP servers that HELO with such a
generic
hostname as that above.
true. better use soapnut.dk in myhostname. Although I doubt this will
help a lot:
- "some" sites will block if the PTR is generic... too many zombies out
there...
- OP's reverse DNS is borked:
$ host 188.183.91.18
18.91.183.188.in-addr.arpa domain name pointer
0xbcb75b12.cpe.ge-1-1-0-1112.hcnqu2.customer.tele.dk.
$ host 0xbcb75b12.cpe.ge-1-1-0-1112.hcnqu2.customer.tele.dk.
Host 0xbcb75b12.cpe.ge-1-1-0-1112.hcnqu2.customer.tele.dk. not found:
3(NXDOMAIN)
so OP not only has a "generic" name, but it doesn't resolve back to the
IP. If he can get his ISP to fix his reverse (preferably using a custom
reverse), then maybe things will get better.
