JIRA: https://jira.spring.io/browse/INT-4159 Port over DSL for the Mail module - make tests compatible with the s-i-test TestMailServer - add `simpleContent` boolean to inbound spec Polishing - add tx() to ImapIdleChannelAdapterSpec More Polishing Rename `Mail.fromMail()` to `Mail.toStringTransformer()` to better reflect reality