Suddenly cannot send or receive mail

mail was working fine earlier in the day. updated to 10.4.10 the day prior. I had changed nothing with the mail preferences. but i am wondering if the problem has something to do with the update. I use cable internet that does not support mac mail!
g3 pismo powerbook Mac OS X (10.4.10)

It shouldn’t matter whether your ISP supports Macs or not. They should still be able to tell you what the right account settings are supposed to be, or whether they’ve made any changes that would explain why Mail suddenly cannot connect to the mail server now...
Open /Applications/Utilities/Keychain Access, choose Keychain First Aid from the application menu, and proceed to repair the keychain. If that doesn’t work, you may try removing the password entry from the keychain and letting Mail create it again the next time it asks for it.
Go to Apple Menu > System Preferences > Network, choose Network Port Configurations from the Show popup menu, and make sure that the configuration used to connect to Internet appears at the top of the list. Leave checked (enabled) only the port configuration needed to connect to Internet and Built-in Ethernet (in that order if not the same), uncheck (disable) the rest of network port configurations and see whether that helps — if it doesn’t, turn ON again the ones you want enabled.
Try using a different method to connect to Internet, if possible, or connecting the computer to Internet as directly as possible (i.e. bypassing any routers that might be present, using an ethernet cable instead of wireless, etc.), or shutting down both the computer and the router/modem used to connect to Internet, restarting, and see whether that makes a difference.

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Suddenly cannot send or receive mail

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