Changelog since Version 4.1.x
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4.1.0 (2011-06-30)
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 * documentation has been converted to ReST

4.1.0 RC1 (2011-06-17)
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New features:

 * changed the Decorator Plugin to allow replacements in all headers
 * added Swift_Mime_Grammar and Swift_Validate to validate an email address
 * modified the autoloader to lazy-initialize Swiftmailer
 * removed Swift_Mailer::batchSend()
 * added NullTransport
 * added new plugins: RedirectingPlugin and ImpersonatePlugin
 * added a way to send messages asynchronously (Spool)