Use an SMTP server for sending all email from your Wordpress MU Blogs. Includes support for Gmail’s SMTP. The plugin uses the robust Swift Mailer for all SMTP handling.
Basically this plug-in is for that your hosting provider IP mail block some famous email providers like yahoo and MSN etc Then you can use alternative SMTP mail server for handling Wordpress MU blog email comunication, all people that have an hosting server that has the php mail function disabled and/or want to use their SMTP servers.
REQUIREMENTS:
- PHP >= 4.3.0
for SSL and TLS support you need to have PHP compiled with openSSL support
http://www.php.net/openssl - WORDPRESS MU >= 2.6 , Tested on wordpress mu 2.6
INSTALLATION:
- copy the “cimy_swift_smtp.php” in to mu-plugins directory and copy whole “Cimy_Swift_SMTP” directory into your mu-plugins directory to activate it.
- Login as Admin > go to Site Admin > Go Cimy Swift SMTP option and update your SMTP setting and test.

DOWNLOAD:
http://wpmudev.org/project/wordpress-mu-cimy-swift-smtp/download