PHP警告：stream_socket_client（）：无法启用加密？

我正在使用swiftMailer直接使用SMTP发送电子邮件。PHP警告：stream_socket_client（）：无法启用加密？

我得到这个奇怪的错误：

2011/09/23 17:59:01 [error] 489#0: *1032 FastCGI sent in stderr: "PHP Warning: stream_socket_client(): SSL operation failed with code 1. OpenSSL Error messages: 
error:140770FC:SSL routines:func(119):reason(252) in /home/nginx/websites/example.com/www/inc/lib/swift-mailer/lib/classes/Swift/Transport/StreamBuffer.php on line 271 
PHP Warning: stream_socket_client(): Failed to enable crypto in /home/nginx/websites/example.com/www/inc/lib/swift-mailer/lib/classes/Swift/Transport/StreamBuffer.php on line 271 
PHP Warning: stream_socket_client(): unable to connect to ssl://mail.xxxxx.net:587 (Unknown error) in /home/nginx/websites/example.com/www/inc/lib/swift-mailer/lib/classes/Swift/Transport/StreamBuffer.php on line 271 
PHP Fatal error: Uncaught exception 'Swift_TransportException' with message 'Connection could not be established with host mail.xxxxxxxx.net [ #0]' in /home/nginx/websites/example.com/www/inc/lib/swift-mailer/lib/classes/Swift/Transport/StreamBuffer.php:273 
Stack trace: 
#0 /home/nginx/websites/example.com/www/inc/lib/swift-mailer/lib/classes/Swift/Transport/StreamBuffer.php(66): Swift_Transport_StreamBuffer->_establishSocketConnection() 
#1 /home/nginx/websites/example.com/www/inc/lib/swift-mailer/lib/classes/Swift/Transport/AbstractSmtpTransport.php(116): Swift_Transport_StreamBuffer->initialize(Array) 
#2 /home/nginx/websites/example.com/www/inc/lib/swift-mailer/lib/classes/Swift/Mailer.php(79): Swift_Transport_AbstractSmtpTransport->start() 
#3 /home/nginx/websites/example.com/www/email.php(23): Swift_Mailer->send(Object(Swift_Message)) 
#4 {main} 
    thrown in /home/nginx/websites/example.com/www/inc/lib/swift-mailer/lib/classes/Swift/Transport/StreamBuffer.php on line 273" while reading response header from upstream, client: xx.xx.xx.xxx, server: example.com, request: "GET /email.php HTTP/1.1", upstream: "fastcgi://127.0.0.1:9000", host: "www.example.com"

是什么意思？谢谢

来源

2011-09-23 Dail

请问您的邮件服务器接受端口587个连接？ –

当然，我使用587与我的Thunderbird – Dail

它是一个PHP的错误？我正在使用：带Suhosin-Patch（cli）的PHP 5.3.5-1ubuntu7.2（内置：2011年5月2日23:00:17） – Dail