Free SMTP Relay Software

I am looking for free SMTP Relay software which can be used to relay mails from my application server.

Also the SMTP relay should have the feature to block SPAM mails & also has an facility for inbox to check the incoming mails which are bounced back due to NDR...

Let me know which is the best free SMTP relay software,.
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SrikantRajeevAsked:
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Dan CraciunConnect With a Mentor IT ConsultantCommented:
Depends on what you're comfortable with.
Linux mail servers can be more stable, but are difficult to configure.

hMail is kind of "point and click" but I do not know how it scales beyond 50 clients.
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Dan CraciunIT ConsultantCommented:
Maybe I did not understand your question properly, but a SMTP relay only relays(sends) emails.
You can couple it with an authentication module so it only sends from authenticated users.

Seems to me that you want a full email server software, that can do IMAP/POP along with SMTP.

If so, you have 2 major options:
1. sign up for a hosting package and the email server will usually be a part of the deal (meaning you can create email addresses and use them to send/receive email).
2. run your own server, using Exchange/Postfix/Exim etc

HTH,
Dan
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SrikantRajeevAuthor Commented:
I would prefer postfix. Can postfix run on Windows O.S
Also can postfix can provide 1 mailbox functionality...
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Dan CraciunIT ConsultantCommented:
I haven't seen anyone running postfix on Windows.

You can try hMailServer on Windows, if you don't want to use Exchange.
It's free and somewhat easy to configure.

HTH,
Dan
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SrikantRajeevAuthor Commented:
Does it also provides anti SPAM & Anti Virus functionality
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Dan CraciunIT ConsultantCommented:
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SrikantRajeevAuthor Commented:
is it recommended to have windows or linux O.S
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SrikantRajeevAuthor Commented:
Thanks
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