I'm Marco Arment: creator of Instapaper, technology writer, and coffee enthusiast.

Lion’s mail.app animates its windows.

Use Rules to Automatically Forward Messages to Another Account

after going through all the apps I could find, I discovered that Things.app is the GTD app I really like best

MailChimp helps you design email newsletters, share them on social networks, integrate with services you already use, and track your results. It's like your own personal publishing platform.

In the post about emulating a browser in python with mechanize I have showed you how to make some basic tricks in the web with python, but I have not showed how to login a site and how to handle a session, with html forms, links and cookies.

You can use email and smtplib modules for that along with any SMTP
relay you have access to, even if it requires authentication - smtplib
has support for that.

Website design, promotion, programming and revenue making
Free CGI, PHP, JavaScript Wizards

PHP allows you to send e-mails directly from a script.

The free open source PGP plugin for Apple Mail.

This “Hawk Wings” blog contains tips and add-ons to make Mail go further, faster, stronger.

Vanish is a research system designed to give users control over the lifetime of personal data stored on the web or in the cloud. Specifically, all copies of Vanish encrypted data — even archived or cached copies — will become permanently unreadable at a specific time, without any action on the part of the user or any third party or centralized service.