Does this also means that we will received alot of spam mail?what it means it that you will not be useing reverse dns lookup to filter out bogus messages so yes you probably will see more spam
thanks
----- Original Message ----- *From:* Cowles, Steve <mailto:steve@xxxxxxxxxxxxxxx> *To:* 'General Red Hat Linux discussion list' <mailto:redhat-list@xxxxxxxxxx> *Sent:* Thursday, April 29, 2004 10:01 AM *Subject:* RE: email problem
> From: Toto Gamez > To: redhat-list@xxxxxxxxxx <mailto:redhat-list@xxxxxxxxxx> > Subject: email problem > > Hi > We're having problem in receiving e-mail, our pque branch is connected > to the internet via myDSL. They are sending email thru smtp.info.com.ph > as their smtp and retrieved mail thru our pop3 located in Pasay (postfix) > but everytime they send email at our domain (@bonheur.com.ph) we cant > received their mails. When I checked the maillog it says: > > Apr 27 16:42:21 pasay postfix/smtpd[31895]: warning: 203.131.180.85: > hostname adsl-131.180.85.info.com.ph verification failed: Host not found
[snip...]
In short, postfix is reporting that the A record and PTR record for the connecting IP do not match. Example: Using your log entry above...
[scowles@voyager log]$ host 203.131.180.85 85.180.131.203.in-addr.arpa domain name pointer adsl-131.180.85.info.com.ph.
[scowles@voyager log]$ host adsl-131.180.85.info.com.ph Host adsl-131.180.85.info.com.ph not found: 3(NXDOMAIN)
I'm not a postfix expert by any means, but I had to configure postfix to be slightly less restrictive with regards to what postfix considers unknown clients. I did so by commenting the following in main.cf
# reject_unknown_client
Personally, I don't like commenting the above, but there seems to be a lot of IP addresses that do not match A/PTR records from legitimate sources. <groan>
Steve Cowles
Bryan Elliott
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