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Mail could not be delivered to <ip address> (for <domain name>). The destination server reported <error code> <description>; try again later. Delivery will be retried later.
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What is the role of the Microsoft Exchange Internet Mail Connector service?
Error code: 451 = "Sender domain must resolve". Some SMTP servers have restrictions in order to discourage unsolicited mail. One such restriction is enforcing the domain name resolution for sender's email address. For example, if someone wants to send a mail saying that it is comming from firstname.lastname@example.org then a DNS query for "acme.com" should return an IP address or host name.
Woodrow Wayne Collins
Error code: 452 = "Insufficient disk space" or "Unable to accept message because the server is out of disk space" or "Out of memory"
Error: "Out of memory" - no info.
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