On 29 Nov 2020, at 9:48, Nikolai Lusan wrote:

Traditionally SMTP systems forced everything to be lower case

This is not true.

RFC821 and RFC822 (1982) both define the local part of email addresses as including upper or lower case letters and optionally case-sensitive with the sole exception of the required "postmaster" address, which systems must treat as equivalent in any mix of cases. In both of those RFCs, the examples used for email addresses typically used mixed-case local parts.

--
Bill Cole
b...@scconsult.com or billc...@apache.org
(AKA @grumpybozo and many *@billmail.scconsult.com addresses)
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