I am getting "Mail Delivery Failed" messages for some of the emails sent.
As I am replying an email, I am sure that there isn't any misspelling on the recipient's email address.
A typical message below.
On 22/06/2015 9:47 am, "Mail Delivery System" wrote:
This message was created automatically by mail delivery software.
A message that you sent could not be delivered to one or more of its recipients. This is a permanent error. The following address(es) failed: ...
Any help would be very much appreciate.
Thanks in advance.