kohestanimahdi No, no, it just shows that it doesn't work when the system shows that it runs. You must be able to communicate with it. For example, telnet ipaddress 25 can communicate.

      aaPanel_thisyear Hello,
      No, when I try to send mail, mail returns to my inbox. I check spam and trash in the receiver's email address.

      I can receive email from my google email, but can not send any mail

          10 days later

          I am having same issue. I can receive email, but cannot send them I don't get any error as reply, but it just shows a pop up this error:

          "Some cloud vendors (such as Google, Amazon) close port 25 by default, and you need to contact the vendor to open port 25 before you can use the post office service normally"

          However, I check Port 25 is open and communicating and I am also running ubuntu

            kohestanimahdi
            Please follow the tips of mailtest to improve your information. If your email score is too low, it may be rejected by other inboxes or put in the trash.

              2 months later
              a year later

              aaP_toolzneeded456
              Hello, please describe your problem in detail. If the server cannot connect to port 25 of other servers, check whether the server provider has disabled port 25

                12 days later

                Some cloud vendors (such as Google, Amazon) close port 25 by default, and you need to contact the vendor to open port 25 before you can use the post office service normally please help

                  aaP_ssquadram
                  hi,
                  We can't solve this problem. It is recommended to contact the server provider
                  Or use smtp trunk

                    10 days later

                    I am also face same problem, I received mails but unable to send mail is anybody here to help me

                      Dear @"aaPanel_Kern" I am using aapanel server My server received mail from other mail but when I try to send mail outside, this shows your message sent successfully but the mail could not reach the given address.

                      Nov 25 05:33:11 webcarehouse postfix/smtpd[27757]: disconnect from unknown[87.246.7.78] ehlo=1 auth=0/1 rset=1 quit=1 commands=3/4
                      Nov 25 05:33:19 webcarehouse postfix/smtpd[27751]: warning: hostname net6-ip78.linkbg.com does not resolve to address 87.246.7.78: Name or service not known
                      Nov 25 05:33:19 webcarehouse postfix/smtpd[27751]: connect from unknown[87.246.7.78]
                      Nov 25 05:33:20 webcarehouse postfix/smtpd[28724]: warning: unknown[87.246.7.227]: SASL LOGIN authentication failed: Connection lost to authentication server
                      Nov 25 05:33:20 webcarehouse postfix/smtpd[28724]: disconnect from unknown[87.246.7.227] ehlo=1 auth=0/1 rset=1 quit=1 commands=3/4
                      Nov 25 05:33:22 webcarehouse postfix/smtpd[27600]: warning: hostname net6-ip227.linkbg.com does not resolve to address 87.246.7.227: Name or service not known
                      Nov 25 05:33:22 webcarehouse postfix/smtpd[27600]: connect from unknown[87.246.7.227]
                      Nov 25 05:33:29 webcarehouse postfix/smtpd[27600]: warning: unknown[87.246.7.227]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
                      Nov 25 05:33:29 webcarehouse postfix/smtpd[27751]: warning: unknown[87.246.7.78]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
                      Nov 25 05:33:29 webcarehouse postfix/smtpd[27751]: disconnect from unknown[87.246.7.78] ehlo=1 auth=0/1 rset=1 quit=1 commands=3/4
                      Nov 25 05:33:30 webcarehouse postfix/smtpd[27600]: disconnect from unknown[87.246.7.227] ehlo=1 auth=0/1 rset=1 quit=1 commands=3/4
                      Nov 25 05:33:37 webcarehouse postfix/smtpd[27757]: warning: hostname net6-ip227.linkbg.com does not resolve to address 87.246.7.227: Name or service not known
                      Nov 25 05:33:37 webcarehouse postfix/smtpd[27757]: connect from unknown[87.246.7.227]
                      Nov 25 05:33:38 webcarehouse postfix/smtpd[28724]: warning: hostname net6-ip78.linkbg.com does not resolve to address 87.246.7.78: Name or service not known
                      Nov 25 05:33:38 webcarehouse postfix/smtpd[28724]: connect from unknown[87.246.7.78]
                      Nov 25 05:33:39 webcarehouse postfix/smtpd[27751]: connect from unknown[141.98.10.153]
                      Nov 25 05:33:39 webcarehouse postfix/smtpd[27751]: disconnect from unknown[141.98.10.153] quit=1 commands=1
                      Nov 25 05:33:43 webcarehouse dovecot: auth: Warning: auth client 0 disconnected with 1 pending requests: Connection reset by peer
                      Nov 25 05:33:48 webcarehouse postfix/smtpd[27757]: warning: unknown[87.246.7.227]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
                      Nov 25 05:33:49 webcarehouse postfix/smtpd[27600]: connect from unknown[141.98.10.153]
                      Nov 25 05:33:49 webcarehouse postfix/smtpd[28724]: warning: unknown[87.246.7.78]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
                      Nov 25 05:33:49 webcarehouse postfix/smtpd[27757]: disconnect from unknown[87.246.7.227] ehlo=1 auth=0/1 rset=1 quit=1 commands=3/4
                      Nov 25 05:33:50 webcarehouse postfix/smtpd[28724]: disconnect from unknown[87.246.7.78] ehlo=1 auth=0/1 rset=1 quit=1 commands=3/4
                      Nov 25 05:33:52 webcarehouse postfix/smtpd[27751]: warning: hostname net6-ip227.linkbg.com does not resolve to address 87.246.7.227: Name or service not known
                      Nov 25 05:33:52 webcarehouse postfix/smtpd[27751]: connect from unknown[87.246.7.227]
                      Nov 25 05:33:55 webcarehouse postfix/smtpd[27600]: warning: unknown[141.98.10.153]: SASL LOGIN authentication failed: UGFzc3dvcmQ6

                      Dear @aaPanel_Kern I am using aapanel server My server received mail from other mail but when I try to send mail outside, this shows your message sent successfully but the mail could not reach the given address.

                      Nov 25 05:33:11 webcarehouse postfix/smtpd[27757]: disconnect from unknown[87.246.7.78] ehlo=1 auth=0/1 rset=1 quit=1 commands=3/4
                      Nov 25 05:33:19 webcarehouse postfix/smtpd[27751]: warning: hostname net6-ip78.linkbg.com does not resolve to address 87.246.7.78: Name or service not known
                      Nov 25 05:33:19 webcarehouse postfix/smtpd[27751]: connect from unknown[87.246.7.78]
                      Nov 25 05:33:20 webcarehouse postfix/smtpd[28724]: warning: unknown[87.246.7.227]: SASL LOGIN authentication failed: Connection lost to authentication server
                      Nov 25 05:33:20 webcarehouse postfix/smtpd[28724]: disconnect from unknown[87.246.7.227] ehlo=1 auth=0/1 rset=1 quit=1 commands=3/4
                      Nov 25 05:33:22 webcarehouse postfix/smtpd[27600]: warning: hostname net6-ip227.linkbg.com does not resolve to address 87.246.7.227: Name or service not known
                      Nov 25 05:33:22 webcarehouse postfix/smtpd[27600]: connect from unknown[87.246.7.227]
                      Nov 25 05:33:29 webcarehouse postfix/smtpd[27600]: warning: unknown[87.246.7.227]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
                      Nov 25 05:33:29 webcarehouse postfix/smtpd[27751]: warning: unknown[87.246.7.78]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
                      Nov 25 05:33:29 webcarehouse postfix/smtpd[27751]: disconnect from unknown[87.246.7.78] ehlo=1 auth=0/1 rset=1 quit=1 commands=3/4
                      Nov 25 05:33:30 webcarehouse postfix/smtpd[27600]: disconnect from unknown[87.246.7.227] ehlo=1 auth=0/1 rset=1 quit=1 commands=3/4
                      Nov 25 05:33:37 webcarehouse postfix/smtpd[27757]: warning: hostname net6-ip227.linkbg.com does not resolve to address 87.246.7.227: Name or service not known
                      Nov 25 05:33:37 webcarehouse postfix/smtpd[27757]: connect from unknown[87.246.7.227]
                      Nov 25 05:33:38 webcarehouse postfix/smtpd[28724]: warning: hostname net6-ip78.linkbg.com does not resolve to address 87.246.7.78: Name or service not known
                      Nov 25 05:33:38 webcarehouse postfix/smtpd[28724]: connect from unknown[87.246.7.78]
                      Nov 25 05:33:39 webcarehouse postfix/smtpd[27751]: connect from unknown[141.98.10.153]
                      Nov 25 05:33:39 webcarehouse postfix/smtpd[27751]: disconnect from unknown[141.98.10.153] quit=1 commands=1
                      Nov 25 05:33:43 webcarehouse dovecot: auth: Warning: auth client 0 disconnected with 1 pending requests: Connection reset by peer
                      Nov 25 05:33:48 webcarehouse postfix/smtpd[27757]: warning: unknown[87.246.7.227]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
                      Nov 25 05:33:49 webcarehouse postfix/smtpd[27600]: connect from unknown[141.98.10.153]
                      Nov 25 05:33:49 webcarehouse postfix/smtpd[28724]: warning: unknown[87.246.7.78]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
                      Nov 25 05:33:49 webcarehouse postfix/smtpd[27757]: disconnect from unknown[87.246.7.227] ehlo=1 auth=0/1 rset=1 quit=1 commands=3/4
                      Nov 25 05:33:50 webcarehouse postfix/smtpd[28724]: disconnect from unknown[87.246.7.78] ehlo=1 auth=0/1 rset=1 quit=1 commands=3/4
                      Nov 25 05:33:52 webcarehouse postfix/smtpd[27751]: warning: hostname net6-ip227.linkbg.com does not resolve to address 87.246.7.227: Name or service not known
                      Nov 25 05:33:52 webcarehouse postfix/smtpd[27751]: connect from unknown[87.246.7.227]
                      Nov 25 05:33:55 webcarehouse postfix/smtpd[27600]: warning: unknown[141.98.10.153]: SASL LOGIN authentication failed: UGFzc3dvcmQ6

                        aaP_iamshoaib216
                        Prompt: SASL LOGIN authentication failed
                        Check whether the email account password is correct. You are advised to reset the password once

                          Dear @aaPanel_Kern I have reset the mail password and tried to send it again but face the same issue My server allows me to send mail on another mail present on the same server, but don't send mail outside the server other mails. Kindly check the logs I have attached below and inform me. I shall be very thankful to you for your kindness.

                          Nov 26 08:45:53 webcarehouse postfix/cleanup[53293]: 4CC8A42190D: message-id=-------------@webcare.localdomain
                          Nov 26 08:45:53 webcarehouse postfix/qmgr[2317]: 4CC8A42190D: from=info@mail.com, size=765, nrcpt=1 (queue active)
                          Nov 26 08:45:56 webcarehouse postfix/bounce[53557]: warning: /etc/postfix/main.cf, line 68: overriding earlier entry: relayhost=
                          Nov 26 08:45:56 webcarehouse postfix/smtp[53169]: 4CC8A42190D: to=mail@gmail.com, relay=smtp.mailgun.org[34.150.216.144]:587, delay=3.3, delays=0.22/0/2.6/0.42, dsn=4.0.0, status=deferred (host smtp.mailgun.org[34.150.216.144] said: 421 Domain sandbox06091835221a4bdba1b37e3cad48d674.mailgun.org is not allowed to send: Sandbox subdomains are for test purposes only. Please add your own domain or add the address to authorized recipients in Account Settings. (in reply to DATA command))
                          Nov 26 08:45:58 webcarehouse postfix/smtpd[51426]: warning: unknown[87.246.7.78]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
                          Nov 26 08:45:59 webcarehouse postfix/smtpd[51426]: disconnect from unknown[87.246.7.78] ehlo=1 auth=0/1 rset=1 quit=1 commands=3/4
                          Nov 26 08:46:00 webcarehouse postfix/smtpd[50130]: warning: unknown[87.246.7.227]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
                          Nov 26 08:46:01 webcarehouse postfix/smtpd[50130]: disconnect from unknown[87.246.7.227] ehlo=1 auth=0/1 rset=1 quit=1 commands=3/4
                          Nov 26 08:46:02 webcarehouse postfix/smtpd[52998]: warning: hostname net6-ip78.linkbg.com does not resolve to address 87.246.7.78: Name or service not known
                          Nov 26 08:46:02 webcarehouse postfix/smtpd[52998]: connect from unknown[87.246.7.78]
                          Nov 26 08:46:05 webcarehouse postfix/smtpd[51426]: warning: hostname net6-ip227.linkbg.com does not resolve to address 87.246.7.227: Name or service not known
                          Nov 26 08:46:05 webcarehouse postfix/smtpd[51426]: connect from unknown[87.246.7.227]
                          Nov 26 08:46:12 webcarehouse postfix/smtpd[50743]: disconnect from localhost[127.0.0.1] ehlo=1 auth=1 mail=1 rcpt=1 data=1 commands=5
                          Nov 26 08:46:19 webcarehouse postfix/smtpd[51426]: warning: unknown[87.246.7.227]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
                          Nov 26 08:46:20 webcarehouse postfix/smtpd[50130]: warning: hostname net6-ip227.linkbg.com does not resolve to address 87.246.7.227: Name or service not known
                          Nov 26 08:46:20 webcarehouse postfix/smtpd[50130]: connect from unknown[87.246.7.227]
                          Nov 26 08:46:20 webcarehouse postfix/smtpd[52998]: warning: unknown[87.246.7.78]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
                          Nov 26 08:46:20 webcarehouse postfix/smtpd[51426]: disconnect from unknown[87.246.7.227] ehlo=1 auth=0/1 rset=1 quit=1 commands=3/4
                          Nov 26 08:46:20 webcarehouse postfix/smtpd[52998]: disconnect from unknown[87.246.7.78] ehlo=1 auth=0/1 rset=1 quit=1 commands=3/4
                          Nov 26 08:46:20 webcarehouse postfix/smtpd[50743]: warning: hostname net6-ip78.linkbg.com does not resolve to address 87.246.7.78: Name or service not known
                          Nov 26 08:46:20 webcarehouse postfix/smtpd[50743]: connect from unknown[87.246.7.78]
                          Nov 26 08:46:32 webcarehouse postfix/smtpd[50130]: warning: unknown[87.246.7.227]: SASL LOGIN authentication failed: Connection lost to authentication server
                          Nov 26 08:46:33 webcarehouse postfix/smtpd[50130]: disconnect from unknown[87.246.7.227] ehlo=1 auth=0/1 rset=1 quit=1 commands=3/4
                          Nov 26 08:46:35 webcarehouse postfix/smtpd[51426]: warning: hostname net6-ip227.linkbg.com does not resolve to address 87.246.7.227: Name or service not known
                          Nov 26 08:46:35 webcarehouse postfix/smtpd[51426]: connect from unknown[87.246.7.227]
                          Nov 26 08:46:35 webcarehouse postfix/smtpd[50743]: warning: unknown[87.246.7.78]: SASL LOGIN authentication failed: Connection lost to authentication server
                          Nov 26 08:46:37 webcarehouse postfix/smtpd[50743]: disconnect from unknown[87.246.7.78] ehlo=1 auth=0/1 rset=1 quit=1 commands=3/4
                          Nov 26 08:46:39 webcarehouse postfix/smtpd[52998]: warning: hostname net6-ip78.linkbg.com does not resolve to address 87.246.7.78: Name or service not known
                          Nov 26 08:46:39 webcarehouse postfix/smtpd[52998]: connect from unknown[87.246.7.78]
                          Nov 26 08:46:41 webcarehouse postfix/smtpd[51426]: warning: unknown[87.246.7.227]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
                          Nov 26 08:46:42 webcarehouse postfix/smtpd[51426]: disconnect from unknown[87.246.7.227] ehlo=1 auth=0/1 rset=1 quit=1 commands=3/4
                          Nov 26 08:46:50 webcarehouse postfix/smtpd[50130]: warning: hostname net6-ip227.linkbg.com does not resolve to address 87.246.7.227: Name or service not known
                          Nov 26 08:46:50 webcarehouse postfix/smtpd[50130]: connect from unknown[87.246.7.227]
                          Nov 26 08:46:50 webcarehouse postfix/smtpd[52998]: warning: unknown[87.246.7.78]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
                          Nov 26 08:46:52 webcarehouse postfix/smtpd[52998]: disconnect from unknown[87.246.7.78] ehlo=1 auth=0/1 rset=1 quit=1 commands=3/4
                          Nov 26 08:46:52 webcarehouse dovecot: auth: Warning: auth client 0 disconnected with 1 pending requests: Connection reset by peer

                          An issue was detected.
                          This means your test email was unable to be sent.

                          Typically this error is returned for one of the following reasons:

                          Plugin settings are incorrect (wrong SMTP settings, invalid Mailer configuration, etc).
                          Your web server is blocking the connection.
                          Your host is rejecting the connection.
                          Recommended next steps:
                          Triple check the plugin settings, consider reconfiguring to make sure everything is correct (eg bad copy and paste).
                          Contact your web hosting provider and ask them to verify your server can make outside connections. Additionally, ask them if a firewall or security policy may be preventing the connection - many shared hosts block certain ports.
                          Note: this is the most common cause of this issue.
                          Try using a different mailer.

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