Sendmail

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I an running CentOS7 in a docker container. I need to send email from that container so I installed sendmail and then I run:

m4 /etc/mail/sendmail.mc > /etc/mail/sendmail.cf` and when I try and send mail it fails with:

larry.martll@gmail.com… Connecting to [127.0.0.1] via relay… larry.martll@gmail.com… Deferred: Connection refused by [127.0.0.1]

Anyone know how I can configure sendmail so that I can send mail?

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