http://pear.php.net/package/Mail/

# pear search Mail
Retrieving data...0%
....50%....Matched packages, channel pear.php.net:
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Package          Stable/(Latest) Local
Mail             1.2.0 (stable)  1.2.0 Class that provides multiple interfaces for sending emails
Mail2            0.1.0 (beta)          Mail, but PHP5 friendly
Mail_IMAP        1.1.0RC2 (beta)       Provides a c-client backend for webmail.
Mail_IMAPv2      0.2.1 (beta)          Provides a c-client backend for webmail.
Mail_Mbox        0.6.3 (beta)          Read and modify Unix MBOXes
Mail_Mime        1.10.0 (stable)       Mail_Mime provides classes to create MIME messages.
Mail_mimeDecode  1.5.5 (stable)        Provides a class to decode mime messages.
Mail_Queue       1.2.7 (stable)        Class for put mails in queue and send them later in background.
Net_Vpopmaild    0.3.2 (beta)          Class for accessing Vpopmail's vpopmaild daemon
Services_Mailman 0.1.0 (beta)          Integrates Mailman into a website using PHP		
		

pear install Mail