Multiple identical mails from Gerrit

[Eli Zaretskii]

Is there any reason why some (or all?) email messages from Gerrit
arrive at my inbox several times?  For example, this message:

  From: "Sourceware to Gerrit sync (Code Review)" <gerrit@gnutoolchain-gerrit.osci.io>
  To: Christian Biesinger <cbiesinger@google.com>,	Simon Marchi <simon.marchi@polymtl.ca>, gdb-patches@sourceware.org
  Auto-Submitted: auto-generated
  Subject: [pushed] Replace SYMBOL_*_NAME accessors with member functions

arrived as 3 identical messages.

Why does this happen?