Ada Email Filter is a free tool to manage and rebuild your Email address list files. It will automatically find and remove the duplicates.
ReconMail
ReconMail is an multi-user email client loaded with tools to help manage your busy email account. Its capabilities include multiple email accounts per user, spam blocking, auto-replying to email, auto-forwarding email.
SecurAttach
SecurAttach allows you to manage the attachment blocking that is built into Outlook XP. It will, through an easy-to-use interface, allow YOU to decide which attachments will be allowed and which will be blocked. No more blocked attachments!
Lyris MailEngine
Lyris MailEngine sends or relays email at up to 150,000 messages per hour, depending on hardware and Internet connection.
Virdi Advanced Mail Processor (VAMP)
Vamp is an advanced and very versatile mail processor. You can extract and collate data from the message body, filter on any header field, send auto-responds, process web-forms, accept/reject mail from specified addresses, mail alerts and much more.
MailWasher Pro
MailWasher Pro is your answer to getting rid of spam, viruses and unwanted e-mail. Effective and easy to use - you'll soon find it becomes one of the most useful programs on your computer.