aaP_kotakomputer.ceo i mean... so i just copy and paste the ssl from web to the mailserver?
login roundcube is on mail subdomain
and the ssl i just paste it from parent domain?

because the issue is the ssl doesn't even added after loading

    Now i get
    " The IP address sending this message does not have a 550-5.7.25 PTR record setup" error

    the way i can fix the error on original post is port "25" filtered (the vps company) said it's open... but it's filtered when i tested with nmap it's said "filtered" so the vps company fix it and now it's solved....

    but now... the new problem is, any email that i sent... never arrive... for gmail user
    it says

    bounced (host gmail-smtp-in.l.google.com[142.251.12.27] said: 550-5.7.25 [103.187.146.233] The IP address sending this message does not have a 550-5.7.25 PTR record setup, or the corresponding forward DNS entry does not 550-5.7.25 point to the sending IP. As a policy, Gmail does not accept messages 550-5.7.25 from IPs with missing PTR records. Please visit 550-5.7.25 https://support.google.com/mail/answer/81126#ip-practices for more 550 5.7.25 information. p18-20020a63f452000000b0042b29871d8asi9632636pgk.247 - gsmtp (in reply to end of DATA command))

    any solution for this?

      Dhanamerdeka
      Hello, find a server provider or network provider to make a PTR record for your ip.
      What is your system like? debian11 has not yet adapted to the mail server

          Solution for all this is....

          • Check port 25 (on my case, the port is opened but by vps operator it's open as "filtered") so we need to fully open it....
          • add PTR records....
            it will goes like this.. PTR
            Name domain.com (with A to the ip example 1.2.3.4)
            Content 4.3.2.1.in-addr.arpa
            TTL Auto

          i hope someone that had similar problem should fixed with my solution

          2 years later

          I`m using Contabo hosting.
          The support team asked me to add the PTR record from my control panel.
          I have two fields In the Reverse DNS management
          IP ADDRESS ( my server IP address )
          PTR RECORD: mydomain.com ( my real domain )

          But, sometimes I get PTR error from Gmail.

          I must say, my DNS management is with Cloudflare.
          Do I need to add PTR to my Cloudflare DNS records?

            It is recommended to consult the VPS provider and check whether the configuration is effective and correct.