So, I've come across an interesting error with OpenSMTPD 6.4.0. I tried sending an email to a virtual user whom I know does not exist on my system. The user is i...@example.org. Instead of an error indicating that the user does not exist, I get the following NDR error: 524 5.2.4 Mailing list expansion problem. My virtual users are stored in a file called virtuals.
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