Event ID - 175

Event Id175
SourceMSExchangeMTA
DescriptionAn error occurred while transferring message <message id>, because per-receipt information could not be downgraded. An X.400 API Association (XAPIA) <error code> reason code and <error code> diagnostic code were returned. [<value> <value> <value> <value>] (14)
Event InformationAccording to Microsoft:
CAUSE:
The custom recipient was created using a numeric-OR-address and also contains a private management domain (PRMD) value. This prevents the X.400 address from downgrading from the X.400 88 version to the 84 version. Consequently, the message is rejected, an NDR is produced, and the above error is logged.
RESOLUTION:
To work around this problem, remove the PRMD value from the custom recipient mail address. This allows the message to be properly downgraded from X.400 1988 mode to 1984.
Reference LinksXCON: PRMD Value in Numeric-OR-Address Wont Downgrade to 84

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