nmjenkins

FastMail will do this if the folder already exists, but won't automatically create the folder.

We have always hosted email (to use your own domain you will need an Enhanced or Premier personal account, or any of the Family/Business accounts). We support XMPP fairly completely I believe; you can certainly set a status! Chat history is saved by default and delivered as emails to a Chats folder in your account (so nicely searchable by our swish new email search infrastructure).

You need to pick a FastMail username to use to log in, even if you want to host your own domain. You never have to use this email address if you don't want to.

Family and business accounts are designed for hosting multiple separate accounts (with full separate logins) under the same (normally custom) domain, all on a single bill. There are features for administrating the different accounts and a shared address book. A personal (e.g. Enhanced) account is a single set of mailboxes/login, however can be used with multiple email addresses/domains.

Hope that answers your questions.

Have you looked at fastmail.fm? We do paid email right. And we have a web interface that's faster, slicker and more powerful than GMail.

Disclaimer: I (obviously) work for FastMail. But still, you should check it out. :)

This technique does indeed work very well. I wrote about it last year, describing how we use it at FastMail to share a single push events connection between all open tabs: http://blog.fastmail.fm/2012/11/26/inter-tab-communication-u...