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I do not use the ec2 server, but had the same error message when trying to send an email, from the command line to my gmail account with ... echo "hello" | mail -s "test email from CLI" myusername@gmail.com My problem was finally solved, when I took out the special character in my gmail password. If using ssmtp, don't forget to update ssmtp.conf with the ...


This situation resolved itself. Though previously repeated with each and every individual update, the most recent batch of updates did not display that suggestion. All the R libraries are working and up-to-date.

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