some of our users are complaining that sometimes when they send emails to our company mails from gmail.com, it is not delivering to the company receipiant mail , they are getting an error
From: Mail Delivery Subsystem <email@example.com>
Date: 18 April 2010 03:19
Subject: Delivery Status Notification (Delay)
This is an automatically generated Delivery Status Notification
THIS IS A WARNING MESSAGE ONLY.
YOU DO NOT NEED TO RESEND YOUR MESSAGE.
Delivery to the following recipient has been delayed:
Message will be retried for 2 more day(s)
Technical details of temporary failure:
Unspecified Error (SENT_MESSAGE): Connection timed out
when we checked our mails server or antispam device, it shows , there is not such mail arrived at our mail server or our antispam device. Where could be the problem, It is not happening to all the mails coming from gmail.com. few mails only and to few users