Here’s the Deal
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When comparing Qmail vs Sendmail, the Slant community recommends Sendmail for most people. In the question“What are the best Linux mail transfer agents (MTAs)?” Sendmail is ranked 3rd while Qmail is ranked 4th.
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Pros
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.
Pro Ability to use the "+" or "-" symbol in the local part of the email address.
Pro Ubiquitous
Due to inertia and historical reasons Sendmail is nearly Ubiquitous on all Unix platforms.
Pro Portability
Sendmail is the only major MTA that's fully ported to Windows.
Cons
Con Unsupported
The original author of Qmail stopped maintaining it in 1998. It was released to public domain in November 2007.
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