Local part of email addresses is always treated case-insensitive about opensmtpd

[poolpOrg]

This is a bug indeed and I have just written a fix that I'll commit as soon as eric@ and chl@ get a chance to review it, most likely this week-end.

OpenSMTPD, like most users nowadays, assume emails to be case-insensitive so that [email protected] and [email protected] will ultimately reach the same user.

Early in the design, I decided that it would NOT support case-sensitive handling because it could always lead to many unfixable issues (ie: useradd GiLlEs; useradd gIlLeS; mail gilles@ -> who gets it ?; there are other issues too during aliases expansion where you could have ambiguity appear all of a sudden while initially you would know who to deliver to).

Therefore OpenSMTPD internally always assumes the final account to be all lowercase which removes any kind of ambiguity. What you experienced was a bug caused by the lowercase() function being used at the wrong place and possibly missing cases, whereas I've just moved it at the session level where all email addresses necessarily pass.

[poolpOrg]

We discussed the former fix @clongeau and @ericfaurot it was incorrect as we are not allowed to modify the user part when relaying.

I have come up with another fix which only affects local deliveries and which is also plugged in a place where we can't miss any case. It has just been committed to OpenBSD and should be synced to Github in a few minutes.

Thanks for your bug report ;-)