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 [22.214.171.124] SMTP error from remote mail server after RCPT TO:: 550-Verification failed for 550-Unrouteable address 550 Sender verify failed