SMTP diagnostic: 550-Verification failed

hello,

when i try to send msg on the email that are on my box it come back with the following error:

- These recipients of your message have been processed by the mail server:
name@domain.com; Failed; 5.1.1 (bad destination mailbox address)

Remote MTA domain.com: SMTP diagnostic: 550-Verification failed for <name2@domain.com>\r\n550-Unrouteable address\r\n550 Sender verify failed

how can i fix this problem?

 

 

 

 

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