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phpmailer mailbox unavailable

Hi Experts,

I am using PHP Mailer and I am getting the following error. I think it has something to do with the mailbox not being on the same server, or some settings. I have had this issue before, but dont remember how I fixed it.

Mailer Error: SMTP Error: The following recipients failed: Requested action not taken: mailbox unavailable or not local.
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David Favor
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I am sorry, but I was waiting for my client to open a mailbox for me to test. I will reopen this once I am ready.

In the meanwhile what is MTA?
MTA (Mail Transfer Agent) like Sendmail or EXIM or PostFix. Some SMTP server code which initiates sending email.