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I've found the error. I didn't configure Dovecot properly. This is the tutorial i used: https://www.crahl.ca/blog/postfixdovecotpostfixadmin-on-ubuntu-14-04/


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As you are trying to send the messages to yourself, configure Exim to authenticate with your gmail credentials when sending the messages. This should work for low volumes that are not being forwarded. Add your credentials to /etc/exim/passwd.client. You should secure this file so that Exim can read it but not general users. I would not recommend this ...


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solution from @victorpacheco3107 worked for me, this what I did in ruby: settings = { address: "smtp.gmail.com", port: 587, domain: "mydomain.com", user_name: "user@mydomain.com", password: "password", authentication: "plain" } smtp_conn = Net::SMTP.new(settings[:address], settings[:port]) ...


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I think Google's response is a bit disingenuous. Even though their "error message" mentions PTR, the 550 5.7.1 is about relaying. I too was getting this error on a Postfix / Dovecot install, but I fixed it via a few step: Adding the IPv6 IP info to your ifcfg-eth0 config on the mail server Adding a AAAA MX record on your DNS Adding the IPv6 ranges of all ...


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You can of course send emails to the gmail domain without using the gmail router, this points to a security or blacklist problem with your domain mail exchange, probably you will need to set up and spf record and check that your mail server is not on an blacklist. you can use gmails dianostic tools here: ...


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Contact Google support. They are actually surprisingly good at helping sort out these kind of issues.


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Exim will use TLS for outgoing connections if it is available and you haven't disabled it. You don't need to configure certificates for outgoing connections. This works on port 25 as well as 587. You can configure hosts that you want to avoid TLS with. TLS on incoming traffic requires a certificate and some setup. You are connecting on the Submission ...



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