Help with VimbAdmine RoundCube - does not receive vps Digital Ocean emails

Hello everyone, good night, I’m having problems without VimbAdmin, I installed everything according to tutorial without link

I asked for Digital Ocean to release the SMTP service.

At the moment the email service is just sending emails, not receiving emails.

When sending email through another email service then I get the message -> Final Recipient: rfc822; Action: failed Status: 5.7.1 Remote-MTA: dns; (, the server for the domain Diagnostic code: smtp; 554 5.7.1 access denied retransmission Last-try-Date: Tue, Oct 31, 2017 14:07:23 -0700 (PDT)

Ubuntu 16.04 Easy Engine Nginx

Someone to help me with this problem

Google for Error 5.7.1 Maybe Reverse-DNS is not set? Please check…

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