It was there. In the spam folder. A false positive.
The inbox, which had been 847 unread messages a moment ago, now showed .
/usr/bin/sa-update && /usr/syno/bin/synopkg restart MailServer
She typed the incantation:
She opened the terminal on her laptop and SSH’d into the Synology. Her fingers hovered over the keyboard. She knew what she had to do: the sacred ritual of the update.