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Securing SMTP Transport - Zend_Mail
Zend_Mail also supports the use of either TLS or SSL to secure a SMTP connection. This can be enabled be passing the 'ssl' parameter to the configuration array in the Zend_Mail_Transport_Smtp constructor with a value of either 'ssl' or 'tls'. A port can optionally be supplied, otherwise it defaults to 25 for TLS or 465 for SSL.
Example #1 Enabling a secure connection within Zend_Mail_Transport_Smtp