Email, Spam Control, Blocked for spam error 554 DT
"554 DT:SPM..." is a receiving server error, indicating that it is the content of the message, not our servers, which is getting blocked. Please review your message, especially the subject line, and re-write anything that may sound like a spam message.
This seems to occur with some regularity, but has never indicated that our servers or IP addresses were getting blocked or were on a blacklist. They do have independent error messages for those cases. We have seen these a bunch with 163.com and netease.
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