您好我正在努力从swift调试此错误。发生率为15-20％。
String Error: #0 public_html/my/library/Swift/classes/Swift/Transport/AbstractSmtpTransport.php(392): Swift_Transport_StreamBuffer->readLine(NULL)
#1 public_html/my/library/Swift/classes/Swift/Transport/AbstractSmtpTransport.php(269): Swift_Transport_AbstractSmtpTransport->_getFullResponse(NULL)
#2 public_html/my/library/Swift/classes/Swift/Transport/EsmtpTransport.php(222): Swift_Transport_AbstractSmtpTransport->executeCommand('MAIL FROM: <inf...', Array, Array)
#3 public_html/my/library/Swift/classes/Swift/Transport/EsmtpTransport.php(304): Swift_Transport_EsmtpTransport->executeCommand('MAIL FROM: <inf...', Array)
#4 public_html/my/library/Swift/classes/Swift/Transport/AbstractSmtpTransport.php(408): Swift_Transport_EsmtpTransport->_doMailFromCommand('info@test.com')
#5 public_html/my/library/Swift/classes/Swift/Transport/AbstractSmtpTransport.php(436): Swift_Transport_AbstractSmtpTransport->_doMailTransaction(Object(Swift_Message), 'info@test.com', Array, Array)
#6 public_html/my/library/Swift/classes/Swift/Transport/AbstractSmtpTransport.php(169): Swift_Transport_AbstractSmtpTransport->_sendTo(Object(Swift_Message), 'info@test.com', Array, Array)
#7 public_html/my/library/Swift/classes/Swift/Mailer.php(82): Swift_Transport_AbstractSmtpTransport->send(Object(Swift_Message), Array)
#8 public_html/my/scripts/email_cron.php(195): Swift_Mailer->send(Object(Swift_Message))
#9 {main}
Line: 156
File: public_html/my/library/Swift/classes/Swift/Transport/StreamBuffer.php
它说这是一个字符串错误，但是，这是什么意思？邮件服务器不可用吗？