There are currently 2882 "A page you created was linked on Wikidata" emails in the mx1001 queue all for the same recipient. The messages appear to be legitimate in that their received headers indicate they originate from www-data on mw*.eqiad.wmnet servers.
These could be simply removed from the queue, but should we investigate further what has caused so many email messages? The volume has caused the remote side to rate limit our mail server which has pushed the number of deferred messages in the mail queue past our alerting threshold.