Gordon Messmer wrote:
On 09/07/2017 08:11 AM, Stephen John Smoogen wrote:
This was always
problematic because DNS hostnames and email addresses in the RFC
standards were case insensitive


Not quite.  SMTP is required to treat the "local-part" of the RCPT argument as 
case-sensitive, and to preserve case when relaying mail.  The destination is allowed to 
treat addresses according to local policy, but in general SMTP is case sensitive with 
regard to the user identifier.

Last time I checked, RFCs said that local parts *should not* be case sensitive,
and cyrus defaulted to treat them case sensitive, which is a default that 
usually
needs to be changed because senders of messages tend to not pay any attention to
the case sensitiveness of recipient addresses at all, which then confuses them 
like
any other error.
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