>This doesn�t seem right to me for using with DMARC. AOL uses 521 for other >anti-spam >purposes as well. Has there been discussion about appropriate SMTP responses?
Looking at RFC 5321, the appropriate response code is 550, which covers rejection for policy reasons. >From the IANA enhanced code registry, the code would be 5.7.1, Delivery not authorized, message refused. R's, John
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