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MailerQ

MailerQ is a high performance Mail Transfer Agent (MTA) and a very fast SMTP server, designed for delivering large volume email messages at very high speeds. MailerQ is fast. Its sole purpose is to send emails. Storing, queuing and prioritizing messages is done in a separate AMQP message broker RabbitMQ MailerQ gives full control over queued messages. Monitor email delivery and intervene when necessary. Prioriziting and routing messages has never been easier..

Sendmail

Sendmail

Sendmail is a general purpose internetwork email routing facility that supports many kinds of transfer and delivery methods, i ...

Exim

Exim

Exim is a message transfer agent (MTA) developed at the University of Cambridge for use on Unix systems connected to the Inter ...