Best openSource replacement for IMail


Hi All,

I'm researching the possibility of replacing -- for cost reasons -- our  IMail server with an openSource solution.

Our  IMail server is currently running on WinNT, with fairly heavily used 1200 user accounts.
I'd like to go with one of the following replacements on a linux server :
Note: I'll need a "web"-based email account access and good Virus checking and security features.
    a) Postfix
    b) QMail

Questions
 1)  Sanity check -- Is what I'm proposing possible/workable  ?
 2)  Are my two replacement choices decent ?
 3) Can anyone forward links, info. on migration from IMail --> Postfix / QMail .... or some other choice you'd recommend ?


Hope to hear from someone with thoughts on the above......


Thanks


Frank


fmisaAsked:
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grbladesCommented:
Hi fmisa,
I am using Suse Openexchange which is commercial software with groupware functionality.

It is based on Postfix as the mail transport agent and CyrusIMAP as the mail store.
I have enabled Spamassassin for email spam filtering as it stops approx 95% of spam with a very low false positive rate.
I have also addedd amavisd-new which is a mail virus scanning engine combined with the clamAV virus scanner.

Postfix, CyrusIMAP, Spamassassin, amavisd-new and ClamAV are all completely free.
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fmisaAuthor Commented:
Great info.

Any thoughts on the last part -- scripts, examples of IMail account migration ?

How much pain do you think I'm in for ?
Or does the public domain offer best practice suggestions, how-to, etc. on this topic  ?

Thanks for helping....
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grbladesCommented:
I am not familiar with Imail but One way you can do it is to setup accounts for everyone on the new server and add those accounts to Outlook or whatever you use. Users will see an additional set of folders for IMAP.
You can then ask them to drag and drop emails or complete folders from their existing email to the new one. Once everyone has had the new accounts setup you can switch mail delivery over to the new system. Then go round to everyone and make sure all old emails have been removed and remove the old account. Once all the old accounts have been deleted you can remove the server.
This is the way I have done it in the past as it can all be done in whatever timescale you wish.

If you can extract usernames/passwords from IMail then you can automate the account setup for everyone.
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fmisaAuthor Commented:
Thanks very much.....
I really appreciate the help....

Take Care....

Frank
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