I did remove most personal information, just wondering what the cause/fix would be. This is the only teacher that has mentioned this problem. There where about 15 recipients that either had a Yahoo address or a 'Y' in their names. It turns the 'Y' into a '?'. Any idea?

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User@?ahoo.com (501 5.1.3 Bad recipient address syntax)

patt?-user@?ahoo.com (501 5.1.3 Bad recipient address syntax)

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