Roaring Penguin Software has an email archiving software solution perfect for small and medium businesses:
CanIt Archiver: A software solution that runs as an appliance at your
location.
CanIt Archiver 30 Day Free Trial
Trying the CanIt® Archiver email archiving and email
continuity software is as simple as jumping to the
evaluation page and filling out a form.
Advantages of the CanIt Archiver Software
Cost-effective in-house archiving solution.
Reduce e-mail related storage issues on your mail server.
Set your own e-mail retention periods.
Video Introduction to CanIt Archiver
This video is a short introduction to CanIt Archiver.
The Three Archiving Problems
Archiving
All messages must be stored safely. This includes inbound, outbound
and internal email.
Deduplicate and compress messages to save disk space.
Encrypt the archive to avoid unintentional disclosure.
Searching
Searches must be easy for end users.
Experts must have flexible search options.
Compliance
Organizations must be able to set their own email retention policies.
All archive accesses must be audited.
Archive integrity must be maintained.
Regulatory requirements (HIPAA, SOX, etc.) must be respected.
Compatible with all major mail servers
CanIt Archiver takes SMTP in and produces SMTP out,
so it is compatible with any mail server including Microsoft Exchange,
Sendmail, Scalix, Postfix, Zimbra, Exim, and more.