Gerrit hitting gmail daily email limits

The limits are described here:
https://support.google.com/a/answer/166852?hl=en

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Exception from Gerrit logs:

com.google.gerrit.common.errors.EmailException: Mail Error: Server smtp.gmail.com rejected DATA command: 550 5.4.5 Daily user sending quota exceeded. - gsmtp

at com.google.gerrit.server.mail.SmtpEmailSender.send(SmtpEmailSender.java:201)
at com.google.gerrit.server.mail.OutgoingEmail.send(OutgoingEmail.java:140)
at com.google.gerrit.server.git.MergeOp$2.run(MergeOp.java:1040)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
at com.google.gerrit.server.util.RequestScopePropagator$5.call(RequestScopePropagator.java:222)
at com.google.gerrit.server.util.RequestScopePropagator$4.call(RequestScopePropagator.java:201)
at com.google.gerrit.server.util.ThreadLocalRequestScopePropagator$1.call(ThreadLocalRequestScopePropagator.java:55)
at com.google.gerrit.server.util.RequestScopePropagator$1.call(RequestScopePropagator.java:98)
at com.google.gerrit.server.util.RequestScopePropagator$3.run(RequestScopePropagator.java:163)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
at java.util.concurrent.FutureTask.run(FutureTask.java:262)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:178)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:292)
at com.google.gerrit.server.git.WorkQueue$Task.run(WorkQueue.java:379)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:745)