Red Hat Postfix FAQ
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Chapter 4. Postfix Install Issues

Table of Contents
4.1 I am using Postfix on Red Hat Linux 6.x. Recently there was an errata update for syslogd which I installed and all of a sudden qmgr has stopped logging. What's wrong?
4.2 I have recently installed Postfix at my ISP and when I start it up it will only run for an hour or so. I think we have too many users on it, (or something) because it spirals steadily down, ending up with no swap and no memory left. Is there a way that we could set a limit on the number of connections, or processes that Postfix can start?
4.3 I am a dial-up user and I've done everything right so far (I think). I can get my mail just fine with fetchmail and mail works locally as it should. The trouble is that my user name on my local account is not the same as my user name at my ISP so my mail goes no where when I send it. What can I do to fix this?
4.4 I'm running a series of restrictions to stop spam and I'm wondering how inbound mail is passed through these checks?
4.5 We are a medium sized investment house and we have some odd legal requirements for our e-mail. Everything sent by everyone has to be backed up locally as documentation for the SEC. Can this be done with Postfix?
4.6 I'm getting an error when I send mail to my own server. It says "mail for mydomain.com loops back to itself". What do I do to fix this?
4.7 When I set up $mynetworks in /etc/postfix/main.cf I used CIDR shorthand (e.g. 127/8). I now appear to be having a problem. I guess Postfix doesn't like shorthand CIDR entries?
4.8 I've got some bounced mail in the queue which is not being accepted by the remote site. How can I remove it from the queue?
4.9 I got a really weird error on startup. It looks like this: “Nov 23 02:10:59 myhost postfix/local[20449]: fatal: unsupported dictionary type: dbm”, what's the problem?
4.10 Is there a good log analysis tool for Postfix?
4.11 Is there an active mailing list for Postfix?

4.1 I am using Postfix on Red Hat Linux 6.x. Recently there was an errata update for syslogd which I installed and all of a sudden qmgr has stopped logging. What's wrong?

qmgr is a long-running process. It's possible that the new syslog/syslogd uses a different interface and/or the previously running qmgr process is not bound to it. In either case, use postfix reload to restart Postfix and a new queue manager.

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3.14 How can I use Postfix from my dial-up machine at home? 4.2 I have recently installed Postfix at my ISP and when I start it up it will only run for an hour or so. I think we have too many users on it, (or something) because it spirals steadily down, ending up with no swap and no memory left. Is there a way that we could set a limit on the number of connections, or processes that Postfix can start?