hwechtla-tl: Cyrus mail address mappings

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Since I could find no documentation on how Cyrus lmtpd actually handles local parts of email addresses, I read the source code and decided to document that here. This is what I gathered.

1. There is a prefix that will cause messages to be delivered to folders named verbatim. By default, the prefix is just "+". For example, to deliver to folder foo.bar, use "+foo.bar@your.server". The prefix can be changed with the setting "postuser"; for example, if you have "postuser: me" in your imapd.conf, the address becomes "me+foo.bar@your.server".
2. "account+folder.name@your.server" will get delivered to folder user.account.folder.name.
3. plus-less local parts will get delivered to the INBOX of the account with the same name.

Remember that the anonymous user should have "p" rights to the folder to actually post into it. If delivery fails because of lacking permissions, the methods fall back to INBOX delivery.