Mailsmith
Email program, formerly owned by Bare Bones Software, now released as freeware by Stickshift Software. Can be customized for powerful editing, filtering and searching. Integrates with SpamSieve and Address Book.
Pando
Send and receive files and folders up to 1GB with your existing email account. It bypasses email attachment limits and accelerates downloads of huge files and folders.
Postbox Express
Lightweight version of the Postbox email client features ultra-fast search, tabbed email browsing, easy message tagging, and integration with Mac OS X. They say it’s simpler and more intuitive than Thunderbird.
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Thunderbird
From the makers a Firefox, an open source email client that features tabbed browsing, filtering and timeline tools, plenty of customization, and robust security measures.