Exchange 2016 error 530 validating sender

In my head-scratching to work out the cause of the error, I had mis-read the message as "Allow all which succ....".

The answer therefore was simple, above that check-box on the relay restrictions tab, there is a options dialog which by default Only the list may relay.

Now, it’s possible that a mailbox will be unavailable because a user has let their inbox get full.

And we often get asked whether, because of that possibility, it’s ok to not remove an email address which has returned a 550 error?

251 – The recipient is not local to the server, but the server will accept and forward the message.

) with a 550 error code, it means that the receiving system could not deliver your email to the user to whom it was addressed because the mailbox is unavailable.

Almost always, this means that the inbox either no longer exists, or that it never existed!

For some reason though, a local restaurant receives this message when sending us emails, even though all other email vendors work. You’re not taking into consideration what the NSA (National Security Agency) does. Then, she answered that Email using my original Email address.

Also, an Email I sent to my partner using a particular Email address garnered a fatal error. I have a friend in Seattle, WA, and one in Spain who send me Emails virtually every day, but when I try to reply to either of these friends using the Email address to which they sent me their Email, I get a fatal error.

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