Mattflaschen added a comment.
Possible solution: On-wiki blacklist per https://www.mediawiki.org/wiki/Extension:Echo#Usage . That will block all Echo notifications triggered by the bot, but I think you'll still see the orange bar (since the bot posts nominations on user talk).
TASK DETAIL https://phabricator.wikimedia.org/T128617
EMAIL PREFERENCES https://phabricator.wikimedia.org/settings/panel/emailpreferences/
To: Mattflaschen Cc: Mattflaschen, Aklapper, Akoopal, tools-nlwikibots-list, SBisson, Luke081515, Catrope, valhallasw, Quiddity