mac_dolar
Hello, please consult the server provider or network provider for rDNS resolution of IP.
The transmission of the dkim indicates that the configuration is normal

    aaPanel_Kern
    the server rDNS is showing on my vps panel.
    so how will I configure it on the aapanel to resolve with my mail server?

      mac_dolar
      Refer to this article. You need the help of a server provider or network provider
      https://en.wikipedia.org/wiki/Reverse_DNS_lookup

        aaPanel_Kern
        why I can send email from the webmail, but I can't send mail using SMTP, its shows this error below
        I have tried connecting using port 25, 587, 465 and yet the same error.. the domain.com is used to reference my domain name.

        Server: mail.domain.com
        User: user@domail.com
        Result: FAILED, code 3016: Failed to send command.

        Transcript:

        220 mail.domain.com ESMTP Postfix

        EHLO mail.domain.com
        250-mail.domain.com
        250-PIPELINING
        250-SIZE 102400000
        250-VRFY
        250-ETRN
        250-STARTTLS
        250-AUTH PLAIN LOGIN
        250-ENHANCEDSTATUSCODES
        250-8BITMIME
        250-DSN
        250-SMTPUTF8
        250 CHUNKING
        STARTTLS
        220 2.0.0 Ready to start TLS
        SSL negotiation failed, code 1: SSL module internal error.
        error:14077438:SSL routines:SSL23_GET_SERVER_HELLO:tlsv1 alert internal error
        AUTH LOGIN
        Failed to send command

        Operation completed: 10/27/2022 5:16:53 p.m.
        Elapsed time: 1.1 seconds

        1) Please what could be the problem?
        2) if possible, please can you give me your email address let me send you my panel login details so that you help me and configure the aapanel mailserver?

        thank you.

          mac_dolar
          Hello, please try to reapply for SSLs at the mail server. At the same time, check the postfix configuration, which can be viewed in the server status
          "mail.135mailtest.com" is replaced with your domain name
          Put:
          smtpd_tls_chain_files=/etc/ssl/private/ssl-cert-snakeoil.key,/etc/ssl/certs/ssl-cert-snakeoil.pem
          Change to:
          smtpd_tls_chain_files = /www/server/panel/plugin/mail_sys/cert/135mailtest.com/privkey.pem,/www/server/panel/plugin/mail_sys/cert/135mailtest.com/fullchain.pem
          Note to replace 135mailtest.com with your domain name.
          Also check /www/server/panel/plugin/mail_sys/cert/135mailtest.com/ for privkey.pem and fullchain.pem files
          You can use this command to check whether the correct SSL is configured
          openssl s_client -connect mail.135mailtest.com:587 -starttls smtp
          or
          openssl s_client -connect mail.135mailtest.com:465 -starttls smtp

            aaPanel_Kern
            please where can I locate this file below you said I should modify?
            smtpd_tls_chain_files=/etc/ssl/private/ssl-cert-snakeoil.key,/etc/ssl/certs/ssl-cert-snakeoil.pem

            I have tried to configure the mailserver many times, but it keeps on not working properly.
            Please wouldn't it be better I give you me aapanel login details so that you help me and configure the postfix mailserver?

            thank you.

              mac_dolar
              Hi, can you give us your aapanel information? The server makes a snapshot backup first, if possible, please send it to kern@aapanel.com.
              It is recommended to fill in the following
              Post link:
              SSH IP address, account password and port:
              aapanel login link address and account password:

              No post link will not be able to know which user's information is

                aaPanel_Kern
                Please check the email, I have sent you the all the server information you requested.

                Please let me know once the issue is solved!
                Thank you so much.

                10 months later

                Hi, please check if mysql is running? can be found in the app store
                Please check whether the database interface can add a test database?
                Please check whether the user and password configured on the website are correct?

                kloudboy

                a year later
                a month later

                aaPanel_Jose I have tried your method. But after changing password, use can;t login to roubcube webmal anymore. Login failed.

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