Workaround for Telnet Server 25 port (unable to send mail)

Today, the client told me that he had a server to send mail to the Domino server via SMTP, but his server could not access the Domino server's 25 port anyway, so let me go over there to help resolve the process <span class="Apple-converted-space"></span> as follows:





Step One: Check 172.1.1.208 25 port is open, after inspection has been opened <span class="Apple-converted-space"></span>





Step Two: access to 172.1.1.208 25 ports by other servers: access to
with my own computer




Conclusion: The problem is not with the 172.1.1.208 server, it should be the server 172.1.1.171 problem or the network problem <span class="Apple-converted-space"></span> between them





Step three: Test the same network segment other machines can access, in the same network segment other servers can access 172.1.1.208 25 port, indicating that the problem is not <span class="Apple-converted-space"></span> a network segment





Step four: Test whether the 172.1.1.171 can connect to the 172.1.1.208 server, the ping command is run through.  





Conclusion: The problem boils down to the problem of setting up the 172.1.1.171 server, and it is not clear where the problems are set up.  





to the network query related situation, in a foreign forum to see the following information: 





You Web application isn't able to reach the SMTP Host using Port = 25.  





Possible reasons=e2=80=a6





1. If Web Server itself relays the email check for SMTP service = under=20 Services and as-as-under IIS.  





2. If Email Relay Server is different make sure your Web server was = Able to=20 reach it (by pinging).  





2a. Verify with admin, whether Port is open.  





3. Check Firewall (software or Firewall server) on your server (to = allow=20, outgoing connection) <span class="Apple-converted-space"></span>





4. Check Firewall (software or firewall server) on Relay server (to = accept=20 incoming connection from your server).  





5. Check the Virus Scanner on your server. Some scanners like = MCAFee/=20 Norton disables mass mailing by default.  





the fifth article for some anti-virus software or firewalls may affect our access to <span class="Apple-converted-space"></span>





Step Five: Disable McAfee antivirus software for mail access monitoring, 172.1.1.208 25 problem solved