

If you want to get technical, SMTP is part of the application layer that uses the TCP/IP protocol (TCP/IP stands for Transmission Control Protocol/Internet Protocol) to send email across networks like the Internet. You’ve likely heard of IP addresses – that stands for Internet Protocol, and is just one example of these kinds of protocols. Protocols are networking-software rules that enable your computer to link with other networks across the globe. It’s a simple set of commands you can use to direct email transfers. SMTP stands for Simple Mail Transfer Protocol. Using Right Inbox to bring your email to the next level.Step by Step Instructions for Setting Up SMTP with Gmail.

Why Would You Want to Set Up SMTP in Your Gmail account?.I don't have a firewall running on the problem machine. These settings, along with my user name, have never failed on any machine I've ever set up on until now. They are both on the same LAN, same subnet. My machines are set up in my lab here at work. I have double checked the settings and re-referenced Google's guidelines on setting up Thunderbird with GMail IMAP. Thunderbird works fine on the XP machine. I also have Thunderbird 2.0.0.19 on a WinXP machine in the same room. I'm using Thunderbird 2.0.0.19 on a new Ubuntu 8.1 installation. Please verify that your SMTP server setting is correct and try again, or else contact your network administrator. The server may be unavailable or is refusing SMTP connections. The message could not be sent because connecting to SMTP server failed. Here's the (infamous) Thunderbird SMTP failure notice: The problem is that I can't send any mail. Connecting, downloading, opening, and saving email is no problem. I have a GMail IMAP account that I like to access using Thunderbird. There are a lot of threads and posts on this issue and I've looked through them.
