Lookup for "214 2.3.0"
This status code indicates a successful delivery or other operation. Any details are simply notes.
Basic Status Code Details (214)
Help message [Information on how to use the receiver or the meaning of a particular non-standard command; this reply is useful only to the human user]
Enhanced Status Code Details (2.3.0)
Other or undefined mail system status
The destination system exists and normally accepts mail, but something about the system has caused the generation of this DSN.