By Kyle Wheeler
This ebook is a short starter for those that are looking to manage a mail server utilizing qmail. It additionally discusses complicated beneficial properties, like internet hosting a number of domain names, intimately. by way of bringing jointly fabric that may take days to discover on-line it will likely be a true timesaver for Sysadmins. This publication is concentrated at method directors conversant in Linux/UNIX and DNS servers who have to organize qmail.
Read or Download Qmail Quickstarter: Install, Set Up and Run your own Email Server: A fast-paced and easy-to-follow, step-by-step guide that gets you up and running quickly PDF
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Additional info for Qmail Quickstarter: Install, Set Up and Run your own Email Server: A fast-paced and easy-to-follow, step-by-step guide that gets you up and running quickly
Sample text
Then qmail-lspawn spawns a qmail-local instance to deliver to that user. The qmail-local instance is spawned asynchronously, so the actual deliveries can occur in any order. In order to execute deliveries safely and securely, the qmail-local program must run with the UNIX User Identification Number (UID) and UNIX Group Identification Number (GID) of the recipient. Thus, qmail-lspawn must run as the root user, so that when spawning the qmail-local program to do the delivery, qmail-lspawn can change to the necessary UID.
This is made relatively easy by the checkpassword-compatible authentication tools—commonly used with qmail-pop3d—which run a specified program upon successful authentication. /Maildir/ This requires a little explanation. The qmail-popup program requests the username and password from the user, which it validates using the program mentioned after the domain name in its arguments—in this case, the checkpassword program. If the username and password are correct, the checkpassword program changes to that user's home directory and runs the program specified in the remaining part of its argument list—in this case, the qmail-pop3d program.
However, qmail-smtpd doesn't always have to invoke qmail-queue to make a decision about the message's size; a size limit may be specified (in bytes) in the control/databytes file or in the DATABYTES environment variable. Any message exceeding the limit is not accepted, and if no limit is specified, qmail-smtpd will not reject a message based on its size. [ 30 ] Chapter 2 The address of the sender is perhaps an unlikely reason for qmail-smtpd to accept or reject a message. However, qmail contains a simple (albeit ineffective against modern spammers) anti-spam mechanism that instructs qmail-smtpd to reject messages based on the sender.