Email Programming Tools, APIs and Services
AOL OpenMail offers AOL and AIM Mail new message counts, folder and message lists, email reading and composing for addition to any web site.
APInbox lets your web app or online service receive email from its users. Smart fields that recognize links and phone numbers, for example, help it parse the messages, too.
CDYNE Email Verification
CDYNE Email Verification lets you add thorough email address verification to contact lists, address books and mailing lists, for example.
DokDok parses email attachments in IMAP accounts and lets your application compare two versions of an attachment, for example.
Elastic Email delivers mail from your cloud application as you go and without commitments.
Email Yak enables web apps (say, discussion forums or media sharing sites) to both send and receive email — filtered and via JSON or XML.
Gmail OAuth lets your app authenticate with Gmail securely and access users' Gmail messages using IMAP and SMTP.
MessageGears sends emails in bulk efficiently and lets you preview the results of a test run, too.
PostageApp is an all-around email sending solution for any web app. It is equipped to handle large volumes, personalization and archiving while keeping its interface simple.
Postmark delivers all transactional emails for you in a simple yet scalable manner.
SendGrid takes over all the headaches potentially involved in sending mail from a web app or service and makes it easy to send, analyze and scale.
Yahoo! Mail Web Services
Using OAuth and coming with libraries for PHP, Python and VB.NET, Yahoo!'s APIs offer full access to Yahoo! Mail accounts — including message parsing and composition.
Message Faces has a database of people's and companies' faces linked to their email addresses. The API lets you request the image or vCard to an email address for use in your program or service.