The "Mail Delivery System" whoever that is, has bounced back emails from someone I have been corresponding with regularly as "Undeliverable" and with the explanation "too many mails for this host" (or something similar I haven't got the exact words any more).
I am using window live mail totally successfully for this and other addresses. The address is a yahoo.com one.
Would someone please kindly explain, in English, what all that means, why is it happening and can I do anything about it.