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Getting SMTP to work?

I've worked and worked and I'm getting all the right responses from the SMTP app I have put on a local computer I have on my home network. I want to be able to use this server to work a mailing list with some of my custom software. I'm not asking for an alternative way to make this work, I'm asking for a way to make this work. I'm using ArGoSoft mail server on Windows XP. I think my problem has something to do with the DNS server, I've tried setting the DNS server address to be my router, and I've also tried to set it to smtp.gmail.com as well as the public DNS 4.2.2.1 and 4.2.2.2. I'm testing it right now using my own email address as the recipient, but even though I'm receiving all the right responses from ArGoSoft on both Telnet as well as my programs, I'm not receiving the emails in my gmail account. Any settings I can change or port forwarding I need to do to get it out to the internet? I just need a one-way SMTP going out, no need for POP3 or anything incoming. I know this sounds like I'm making a spam server, but I plan on ethical uses for this server. Please, no flaming.

Public Comments

1. Probably your mail is being rejected by recipient because it comes from an IP address that is not a valid MX for the domain you are sending it from. Are you using a valid Domain name for your from address? if so, you need to add an MX record to that Domain's DNS with your IP (external) address.