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SMTP Cannot send message using the server xyzzy

3667878 shared this question 3 months ago
Need Answer

Every now and then, I get this, and it goes away after a day or two, sometimes longer. But generally only arrives every 4-9 months, then it's gone again.

DNS resolution is working to smtp.mailbox.org ( though pings time out.

My gut tells me the mailbox.org smtp server is wonky as everything else works, I even receive email from that mailbox. Client is setup using their Mac profiles so it's not that.

Anyone else get this?

Comments (1)


Maybe temporary blocking mechanism, because their systems thinks, you’re an spammer?

Open a ticket. The support will help I think.