ocket8888 commented on issue #2036: Store case-insensitive user info in DB URL: https://github.com/apache/trafficcontrol/issues/2036#issuecomment-557182186 According to [Section 2.3.11 of RFC5321](https://tools.ietf.org/html/rfc5321#section-2.3.11): > _"... the local-part MUST be interpreted and assigned semantics only by the host specified in the domain part of the address."_ Where email addresses are of the form `{{local-part}}@{{domain part}}`. So we MUST treat [email protected] as distinct from [email protected], although *not* distinct from [email protected]. I don't know, though, if any widely-used email providers actually treat local parts as case-sensitive (e.g. GMail does not), but they are allowed to.
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