When comparing MailerQ vs Exim, the Slant community recommends Exim for most people. In the question“What are the best Linux mail transfer agents (MTAs)?” Exim is ranked 1st while MailerQ is ranked 5th. The most important reason people chose Exim is:
Most Linux distributions that come with Exim, come with sane Exim default configurations. Changing default values and slightly adjusting configuration is relatively easy. On the other hand, building a completely new Exim configuration file from scratch might not.
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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 Easy to use
Most Linux distributions that come with Exim, come with sane Exim default configurations. Changing default values and slightly adjusting configuration is relatively easy. On the other hand, building a completely new Exim configuration file from scratch might not.
Pro Good documentation
Exim provides thorough documentation with great examples.
Pro Sendmail compatible
Exim is a drop-in replacement for Sendmail.
Cons
Con Missing some features
Missing featues like: webmail, ActiveSync, WebAdmin.
Con No support for some protocols
No support for: POP3, IMAP, POP3s (POP3 over SSL).