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Re: Ntlworld blocking mails
452 seems to be defined as "insufficient storage", not sure if that means the server is in trouble, or the recipient has allowed their mailbox to overflow.
The other thing, it appears that your dialog is talking DIRECTLY to an NTL SMTP server for delivery to an NTL account, from a non-NTL account - wrong, and a spammer tactic that would be better banned by ALL servers.
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