Downcase e-mail on signup and subscription
Sometimes people signup with a capital letter for an account, while their actual emailadress is all downcased. Leading to not finding the list they are admin of in the webinterface.
While email would be case-sensitive (afair) most email providers actually treat emailadresses as case-insensitive. So I would suggest to downcase the email on signup. Actually we should do the same on schleuder side, not?
I would suggest to downcase subscriptions in schleuder and hence also the email field of an account with the possibility of breaking email providers that are case-sensitive. But honestly, I think they will be in way more sever problems than schleuder not respecting their casing.
I'm not sure if this is allowed to go into the next minor or patch version, according to SemVer, so leaving this without a milestone for now.