‘Sending has been paused due to a technical issue with SMTP: Expected response code 354 but got code “503”, with message “503-All RCPT commands were rejected with this error: Unprocessed subscriber: (****** <******@delpierre.wanadoo.co.uk>)’
I’ve searched for a solution and read your knowledge base, but I still keep getting these error messages. I’ve tried different sending methods, I’ve tried deleting subscribers (but I really shouldn’t have to), my host is not blocking these addresses, but I haven’t been able to send even one mailing because of this. I delete one address, and then immediately receive another error message with another.
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