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The error message template option is only for pro subscribers and allows you to
edit the template which is seen here. Everything is automatically customized in
terms of prefilling your email address
and today's date, but in case you want to update this with another message
you can easily set that here. Otherwise click the Default Template button and close.
Then the default bounced message template will be installed for blocking email. Search for Block Sender for Gmail
in the Google Chrome App Store.