July 10th, 2009, 09:24 AM
Originally Posted by nara_456
I configure Mail Server in Ubuntu. Internally it is working fine
when i tried to send mail to outside network
like gmail or yahooo
the mails are not going out
Do I Need to register my domain to send mails out side the network ?
Welcome to Dev Shed.
1) Verify your ISP isn't blocking port 25. (Provided you haven't already changed the port number from 25)
2) Verify that your router/firewall has the appropriate port forwarded/opened.
3) Set up RDNS with your ISP. Many ISP's will either flag the email as spam or just not deliver it if it doesn't have a proper RDNS record. If it's only sites like Yahoo and Gmail, then this is probably the problem. If it's all sites, then it may be one of the above options.