Outgoing emails to btinternet blocked.
ERROR_CODE :421, ERROR_CODE :Too many messages (1.5.6.1) from 74.201.84.163
I have been having problems sending to btinternet.com and btopenworld.com for the past week. First 'email delayed' message, and then 'delivery failed', as above.
Looks as though someone is spamming from the ZOHO email server 'sender163-mail.zoho.com'
Surely this is abuse of your system, and you should be able to trace who it is (if it is a registered user of Zoho mail?) and block their account.
An email system is really no use to me if it can't deliver emails because it has been blocked?
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