Email not send, getting 550 error

Email not send, getting 550 error

Hi,
I'm getting 550 error while sending emails to some recipients (not all the times).

Same thing but without any error Message (email not received by recipient) also happened.


Here is some additional details Reporting-MTA: dns; mx.zohomail.in
Arrival-Date: Tue, 23 Jul 2024 10:22:22 +0300

Original-Recipient: rfc822; a.emam@GULFCABLE.COM
Final-Recipient: rfc822; a.emam@GULFCABLE.COM
Status: 550
Action: failed
Last-Attempt-Date: 23 Jul 2024 07:22:44 GMT
Diagnostic-Code: Requested action not taken: mailbox unavailable or not local.
Remote-MTA: dns; 37.48.81.29

Original-Recipient: rfc822; c.fehd@GULFCABLE.COM
Final-Recipient: rfc822; c.fehd@GULFCABLE.COM
Status: 550
Action: failed
Last-Attempt-Date: 23 Jul 2024 07:22:44 GMT
Diagnostic-Code: Requested action not taken: mailbox unavailable or not local.
Remote-MTA: dns; 37.48.81.29

Original-Recipient: rfc822; j.pangilinan@GULFCABLE.COM
Final-Recipient: rfc822; j.pangilinan@GULFCABLE.COM
Status: 550
Action: failed
Last-Attempt-Date: 23 Jul 2024 07:22:44 GMT
Diagnostic-Code: Requested action not taken: mailbox unavailable or not local.
Remote-MTA: dns; 37.48.81.29

Original-Recipient: rfc822; javeed@GULFCABLE.COM
Final-Recipient: rfc822; javeed@GULFCABLE.COM
Status: 550
Action: failed
Last-Attempt-Date: 23 Jul 2024 07:22:44 GMT
Diagnostic-Code: Requested action not taken: mailbox unavailable or not local.
Remote-MTA: dns; 37.48.81.29



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