You can generally find your SMTP email server address in the account or settings section of your mail client. When you send an email, the SMTP server processes your email, decides which server to send the message to, and relays the message to that server.

How can I find my SMTP server?

Select your email address, and under Advanced Settings, click Server Settings. You'll then be brought to your Android's Server Settings screen, where you can access your server information.

How do I find my SMTP server IP address?

Type "ping," a space and then the name of your SMTP Server. For example, type "ping smtp.server.com" and press "Enter." The window will then try to contact the SMTP server by the IP address. It will say, "Pinging x.x.x.x with 32 bytes of data." The "x.x.x.x" will be the SMTP server's IP address.