Fail2ban not sending email

I set up Fail2ban as per this page: https://help.ubuntu.com/community/Fail2ban I tried looking in several pages among other: https://stackoverflow.com/questions/25890510/fail2ban-not-sending-email-notifications I use Ubuntu server 18.4.29 Most things are default. But followed that page to make it send e-mail to a certain address. But none is sent. I do: cat fail2ban.log | less from directory where fail2ban.log is…

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