PHP无法通过mail.OURDOMAIN.com端口25连接到mailserver…但是，我可以通过telnet测试邮件

Question

There's a million posts on this error out there on the web: Failed to connect to mailserver at "mail.OURDOMAIN.com" port 25, verify your "SMTP" and "smtp_port" setting in php.ini or use ini_set()

Here's the facts:

Before our site was forced to join the companies large SMTP server pool, our configuration was working fine (using a SMTP server managed by another group). As soon as we pointed the SMTP server entry to the new SMTP server, we get 'failed to connect' issues.

I can telnet to mail.OURDOMAIN.com 25 and successfully send a test mail through manually -- it should work.

I have the correct settings in php.ini and I've restarted the webserver.

I also have used ini_set() for these settings and get the same results.

Very odd... any suggestions here?

I'm using this code to test:

<?php 
//change this to your email. 
$to = "joe.guy@OURDOMAIN.com"; 
$from = "joe.guy@OURDOMAIN.com"; 
$subject = "Hello! This is HTML email"; 
$message = "hello";
$headers  = "From: $from\r\n"; 
$headers .= "Content-type: text/html\r\n"; 
mail($to, $subject, $message,$headers); 

echo "Message has been sent....!"; 
?>

Here are my php.ini settings:

[mail function]
; For Win32 only.
; http://php.net/smtp
SMTP = mail.OURDOMAIN.com
; http://php.net/smtp-port
smtp_port = 25

; For Win32 only.
; http://php.net/sendmail-from
;sendmail_from = joe.guy@OURDOMAIN.com

; For Unix only.  You may supply arguments as well (default: "sendmail -t -i").
; http://php.net/sendmail-path
;sendmail_path = "\"C:\xampp\sendmail\sendmail.exe\" -t"

Answer 1

Try using the ip address of your domain instead of the name. That has worked for me a number of times.

[mail function]
; For Win32 only.
; http://php.net/smtp
SMTP = 127.0.0.1  

ie: your own ip smtp server ip adress