pegboard is a social bookmarking service that lets you save, search, share and tag your bookmarks with people all over the world!
Allow your application to receive mail via this app/api.
Bulk and Transactional email service from Amazon.
A weird twitter client-like app for OS X and your google email.
Campaign Monitor on the most recent evolution (via Panic) in email marketing & list growth.
Articles about email marketing on the Smarter Marketing blog.
Lauren Miller of BSD on how the GOP blew it with their first "Weekly Trunk" email.
Freshview (of Campaign Monitor fame) release a new guide to CSS support in email clients.
Some really good Smart Mailbox configurations for Mail.app.
Nice RSS (mainly) tools with beautiful unification of several copycat services.
Amazing breakdown of CSS support in various email clients (web and application)
How to send email with PHPMailer from your CakePHP application.
How to make HTML email (and make them right?)
Newsletter plugin that lets you create email newsletters within textpattern. (Try this out)
Adds PGP functionality to Apple Mail.
The opensource roundcube webmail project that interfaces with IMAP mail servers
How to enable thunderbird OPML import/export
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