When comparing MailerQ vs Qmail, the Slant community recommends Qmail for most people. In the question“What are the best Linux mail transfer agents (MTAs)?” Qmail is ranked 4th while MailerQ is ranked 5th. The most important reason people chose Qmail is:
Qmail was built ground up with security in mind.
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Pros
Pro Fast and reliable
Only MTA out there built on RabbitMQ, a message queeing broker, which means that no messages are stored on the disk, increasing the performance speed of your deliveries as well as reducing unnecessary hardware costs. Setting up in a cluster, both RabbitMQ and MTA will make sure that in case of a server fail, the messages are continued to be delivered and the other cluster picks up the slack.
Pro Scalable and highly controllable
This product is highly scalable and configurable to your exact requirements. With a friendly Management Console, you can adjust and set all the settings on the go as well as control and oversee your campaigns and clients. The MailerQ keeps building new features which means that customer needs and requirements are taken in consideration to add valuable and good features.
Pro Excellent security
Qmail was built ground up with security in mind.
Pro Fast
Qmail parallelizes mail delivery to increase speed.
Pro Easy to maintain
Configuration of Qmail is sane and straightforward.
Pro Sendmail compatible
Qmail is a drop-in replacement for Sendmail.
Cons
Con Unsupported
The original author of Qmail stopped maintaining it in 1998. It was released to public domain in November 2007.