Address alias collision - unusable alias

[stahlkarl]

Hi!
Than you for providing the source code for this excellent service!

While reading
https://github.com/m242/maildrop/blob/master/common/src/main/scala/com/heluna/maildrop/util/AltInbox.scala
I realized that two identical addresses (except for the non alfa-numeric characters) would result in the same alias. Ex:
http://maildrop.cc/inbox/alfred
http://maildrop.cc/inbox/alfred+-~
Both have the alias: D-2aa0sp7@maildrop.cc

When sending an email to the alias address, it only appeared in the "alfred" inbox.

[m242]

They're also case insensitive; /inbox/alfred and /inbox/ALFRED will have the same alias. This is more or less by design, but if you want to strip this out, you can remove the ".toLowerCase.replaceAll" method calls in getAltInbox and getRegularInbox.