Troubleshooting
I've set up my email client, but I seem to be having trouble sending mail. It keeps bouncing with a message about sender domain must resolve.
You've probably configured your email client to use your localhost's sendmail instead of your ISP. This will no longer work, thanks to spammers'abuse of the email systems. Most MTAs don't accept mail from systems if they don't have a valid MX record. Change your email client to point to your ISP's outgoing mail host.
I set up my email at home to run through the sendmail server at my work rather than at my ISP, but I keep getting an error message 550 relaying denied and the messages won't go out.
By default, sendmail will not permit any messages to come from an external system with another ...
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