Moved iMac to different room; can't send e-mail!

I moved iMac to a different room and am picking up a different wireless signal with airport card. my internet connection is strong, i can receive e-mail messages with both Mail and Thunderbird, but i can't send them! it says there is an error and i should check the address. what should i do?
thanks,
R

You're picking up a different wireless signal? Hmm...
Hard to say for sure without more details about your network and your ISP. But it doesn't sound like an email reader problem. It sounds more like a network issue since you seem to be saying you changed networks.
If it's not your signal, then it's somebody else's internet connection, and that might be with a different ISP (internet service provider). Without the proper settings for sending email with that ISP, your email won't go through. This is to deter unprivileged people from abusing the email servers to send spam, and to prevent the privileged user of the internet connection from being blamed for someone else's actions.
If this is the case, simply select the other wireless signal with your own internet connection and your email should work fine again. Not to mention, you won't be disrespecting your neighbor and their ISP anymore.
If you need to boost the signal of your own wireless network, you can check the settings of your wireless router and see if you can boost the power output or reduce the speed. Most of the time reducing the speed isn't noticeable since wireless routers are potentially 6 to 20 times faster than broadband internet connections. You might be broadcasting at a higher rate than is possible for you to use, and hence reducing your range.
MacBook 2.0 GHz Intel Core Duo   Mac OS X (10.4.7)   512 MB RAM

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