After installing a ISPConfig3 Perfect server, I am not able to send messages to other mail servers, I get errors in the mail queue. this is the message it displays in the mail queue Sorry for my ignorance but i am actually new here host alt2.google mail domain[142.250.153.26] refused to talk to me: 421 4.7.0 Not allowed. later this changed to onnect to alt2.gmail-smtp-in.l.google.com[2a00:1450:4013:c16::1b]:25: Network is unreachable) host maildomain[108.166.181.204] refused to talk to me: 421 4.7.0 Not allowed.) Also my setup has roundcube installed but the default url says : domain:8081/squirrelmail/ how do i change it possibly mail.domain name.tld how do i get SSL encryption on the ispconfig server, the page where all users manage their service from.
Seems like your provider blocks outgoing traffic on port 25. Port 25 is required for communication between mailservers. Ask your provider to unblock this port for you.
This is a server i worked on inhouse at our server room, from the ISP he said they have not blocked any port as they raw internet. Also this IP is directly configured on the server.
That's for incoming connections, not outgoing. Some firewall must be blocking outgoing traffic on port 25. Try it with this command from the server: Code: telnet smtp.google.com 25
After running command this is the reply Escape character is '^]'. 421 4.7.0 Too many connections. Connection closed by foreign host.
Heres the list from Google what there error codes indicate: https://support.google.com/a/answer/3726730?hl=en This indicates that your server is trying a lot of connections to googles mailservers. You may want to check what is happening there and where these connections come from. This could also indicate bad reputaion or rate limiting. Make sure your mailsystem is set up correctly and mail authentification mechanisms are set up.
