Here is a short least of the choices:
Google apps for your domain
- Free
- Easy
- Good collaboration features
- Proprietary SAAS based – (could back up data offline with various utilities)
- Some people worry about privacy – see privacy and security statement from Google – Google apps security whitepaper
Ubuntu/Linux native email server postfix etc.
- Free and open source
- Not very easy to use and setup – see graphical front ends like webmin
- No collaboration features
- Free, open source, platform independant
- Easy to install, maintain and administer
- Not backed by reliable commercial organization
- Not considered very robust for large enterprise deployments
Zimbra
- Requires a dedicated server (can’t use server for anything else) and minimum 4 MB Ram
- Platform independant
- Has a community version and premium commercial offerings
- More complex installation
- Backed by a large commercial organization (yahoo)
- Suitable for large enterprises
Conclusion – I prefer Google apps for your domain, but you can make your own choice.
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