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Hi Mike -
we get this error frequently but had it before and after our 820 to 520 migration. We usually get them with one of our offices runs a large e-mail send and there are invalid addresses in our database. Not just undeliverable but malformed (e.g. "mary@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx" - yes this was an actualy address entered by one of our students)
That's not a malformed email address. That's mary at subdomain/host something at domain comormaybesomething.net
While it's not typical to include a subdomain/host name on the right-hand side of the @, it's certainly allowed. In fact, there can be multiple subdomains. E.g.
mary@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxSee http://www.rfc-editor.org/rfc/rfc2821.txt specifically section 4.1.2 forward-path syntax.
Ken http://www.kensims.net/ Opinions expressed are my own and do not necessarily represent the views of my employer or anyone in their right mind.
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