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* GH-3356: Add the way to not load mail message Fixes https://github.com/spring-projects/spring-integration/issues/3356 In some cases it is not necessary to have a whole mail message to be load when it could be filtered out downstream * Treat "no eager load" for `MimeMessage` in the `AbstractMailReceiver` when no `headerMapper`, not `simpleContent` and no `autoCloseFolder` * Fix language in Docs Co-authored-by: Gary Russell <grussell@vmware.com> Co-authored-by: Gary Russell <grussell@vmware.com>