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is there any open Source Mail Server ?

I want some mail server with open source on linux , so that i can modify myself for my application .

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closed as not constructive by Sathya Dec 10 '12 at 2:37

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Lots. What's the requirement? –  mas Jul 29 '09 at 14:45
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Development Language? Platform? Purpose of modification? –  Diago Jul 29 '09 at 15:47
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7 Answers

up vote 7 down vote accepted

There are several widely used free email servers of which the best known are:

Edit: Apparently DJB has relaxed the restrictions on modifying qmail. Props to tkadlubo for noting this.

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Qmail licensing terms changed in 2007. DJB released it into the public domain. You now can distribute modified versions. –  Tadeusz A. Kadłubowski Jul 30 '09 at 8:34
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Wikipedia has a big list of mail servers, but doesn't mention which ones are free.

For Linux there's postfix, exim and plenty more.

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For windows hMailServer and Argosoft mailserver.net.

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The most common mailserver of this type is "Sendmail" most unix systems either have it installed or can add it as a package. Sendmail will run in a Cygwin shell if you want to run it on a windows box or you can download a cross platform version.
Sendmail is tried, tested and a very mature program. You can do quite a bit with it!

Hope this helps you find a good starting point.

http://www.sendmail.org/

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6  
Sendmail is also quite difficult to configure if you're not already used to it (I've tried). I happen to prefer Postfix for this reason, although admittedly Sendmail is more mature. –  David Z Jul 29 '09 at 16:20
    
Sendmail maybe more mature, but there is absolutely nothing wrong with Postfix. –  innaM Jul 30 '09 at 8:13
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There's also qmail but I like postfix more.

Also, you can try eBox Platform which integrates postfix. (disclosure: I work for eBox)

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If you need to hack your mail server (why, oh, why?), maybe you should take a look at the LamsonProject.

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If you are a beginner, postfix is the easiest to configure, and its quite fast and secure. I heard Exim is good, but i havn't used it.

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