I appear to be having more issues with the mailing list for the muse-letter. Mails either look like they're being sent and not received or getting rejected by the remote server with an error 450: "too many emails from this sender".
The mailing list software on my host doesn't seem to like addresses added as BCCs so I may be on for another rethink of how things work.
If anyone subscribed has received multiple emails then I apologise. If emails haven't been received then that's a bummer too.
In any event, the latest letter can be found here