Mail server

Hi: I just want one favor regarding mail server if anyone can advise for me. I have a small company of 100 users and have implemented Postfix mail sever when we were 10 users in normal P4 machine. Now a days users are facing lot of problem like mail is going in QUARANTINE, SPAMING AND MAIL GOT DISCARDED. Which is not good for our organization.
I want to implement such mailing system from which I can get rid of this type of problem and mail runs with 100% accuracy and no such incident happened. Please advise which is the best mailing system which I need to Implement in our organization.

Warm Regards
Sanjeev jhaAsked:
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Leroy LuffHead of IT & DIgitalCommented:
Exchange server 2013 is definitely the best route to go.
Do you mean you are the spamming source? If so, first make sure your users always have a subject. mails without subjects automatically get flagged as spam with most mail clients. Also tell your users not to use the common spam words, like pharmacy, drugs, sex, etc in their mails. Mails with such contents are also usually flagged as spam.

As for the mail server, I suggest you use zentyal server, which is based on ubuntu server and very easy to setup. It has a modular system which allows you to select those server modules you want to use, and it includes OpenChange, which is exchange compatible. The community edition is free, but you don't get support, or rather only via their forums. If you want to get support, you need the commercial version.

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I've been using them for years to filter spam. Awesome company and low cost.
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David Johnson, CD, MVPOwnerCommented:
Office 365 is my suggestion but I'm not that impartial
Sanjeev jhaAuthor Commented:
Thanks to all for your advise.
Sanjeev jhaAuthor Commented:
Thank you very much and planning to implement.
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