550 Verification Failed while sending mail to "@aceinstrumentshyd.com"
I get the below failed mail when I send to "@aceinstrumentshyd.com" domain:
From: Mail Delivery System
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:
[email protected]
host mail.net4india.com [118.67.248.42]
SMTP error from remote mail server after RCPT TO::
550-Verification failed for
550-Unrouteable address
550 Sender verify failed