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Qmail Help Section
Installation Questions
Will qmail install on a RedHat Fedora server?
What file system is recomended with qmail?
Should I use maildir or mbox storage for my user accounts?
What is the supported POP toaster for qmail?
How can I get qmail to act as a second MX to some domains?
How can I load balance incoming email across a few servers?
What control panel is recommended for qmail?
How does qmail handle multiple branch offices?
Post Install Questions
How can I set qmail to not accept mail for unkown local users?
SMTP connections to my server are really slow...What's wrong?
Can I stop some users receiving external email?
Can I force qmail to use a specific IP?
Config Questions
Does badmailfrom control file operate on the "From:" header, the"Return-Path" or something else?
Can you run qmail on a non-standard port?
How do I forward all inbound emails to two different servers?
Can you use wild cards in rcpthosts?
Can I add resiliance by adding multiple smtproutes values?
How do I tell qmail to do more deliveries at once?
How do I limit the size of emails on my network?
Can you have per domain quotas and DATABYTES settings?
I would like to set a site wide DATABYTES variable, but allow certain users to bypass this...can this be done?
General Questions
Can I limit the size of the To,CC, or BCC?
Where can I get information on SMTP AUTH for qmail?
Is there a way to know if the sender of a message really exists before accepting his message?
How do I send an email to every user on my system?
How do I delete all email that is sent to a particular alias?
How do I delete old email from my users accounts?
Why do outgoing mails have an address of user and not as user?
Are HELO and/or EHLO necessary with qmail?
How can I stop qmail-send...it wont stop!
How often does qmail retry to send email?
How do I store a copy of incoming & outgoing mail in an archive?
I receive plenty of duplicate emails. How can I stop them?
Why can't I send mail to a large site with lots of MX's?
Relay tests with the user%domain.com format are accepted...am I anrelay?
Can you recommend a good mailing list manager?
When does qmail use the second MX record?
I get duplicate emails...why?
Bounced Email Questions
I have a huge spam problem, Can I send double bounces to a black hole?
Is there a way for qmail to discard an unknown recipient message WITHOUT any bouncing?
Is it a bad idea to send a 550 response instead of bouncing an email?
How do I get rid of double bounces?
Spam / Virus prevention
What is SPF (Sender Permitted From)?
Does SPF break email forwarding?
What is the supported way to use RBL lists?
My server failed therelay check at maps...what will I do?
I use RBL lists on my qmail server, how do I allow certain email addresses to bypass RBL
I use several RBL lists, but these checks take some time, can I speed this up?
I use the tcp.smtp file to block known spammers by IP...is this a good practice?
How do I block viruses using qmail?
As a method of spam prevention, should I bounce email that comes from servers that are not the MX of the senders domain?
Log Files
I have strange files appearing in /var/log/qmail !!!
How can I decipher qmail's logs?
How do I reformat strings in the "s" format to readable formats?
Error Messages
undefined reference to 'errno'
alert: cannot start: unable to switch to queue directory
The server responded: 451 qq read error (#4.3.0)
Connected_to_hhh.ttt.yyy.xxx_but_connection_died._Possible_duplicate
tcpserver:fatal:unable to bind address already in use.
AUTORESPOND:_too_many_received_from
deferral: CNAME_lookup_failed_temporarily._(#4.4.3)/
Apple OSx -- Kernel Panic
-ERR unable to scan $HOME/Maildir
.qmail_has_prog_delivery_but_has_x_bit_set._(#4.7.0)
Problems with the Queue
I have quite a bit of email in my queue that is bouncing...how can I clear it?
Server Moves (hardware or IP changes)
Is it a problem to change the IP of a qmail server?
How do you move a queue to another server?
Posting Questions to the Qmail Mailing List
How to Use the qmail Mailing List Effectively
Every time I post a message to the qmail mailing list I get a qsecretary confirmation...why?
How do I unsubscribe from the qmail mailing list?
Perl Tutorial
Your first program
Running the program
Errors in files
Scalar variables
Operations and Assignment
Outputing Variables
Array variables
Array assignments
File handling
Repeating Commands (loops etc)
Conditionals
String matching
Substitution and translation
Split
Returning values
Associative arrays
Environment variables
Subroutines
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