How can I keep emails sent to me from a domain or a specific address, from being rejected as spam?
I want to know this as well.
Someone tried to send me an email and got the response:
SMTP error from remote mail server after end of data: 554 5.7.0 Reject, id=3928846-06 - spam
But is not spam.
You have to contact the mailbox.org support via help.mailbox.org
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