Cannot send e-mail - "The sender address invalid" error message

Today I keep getting this error message "The sender address is invalid - when i try to send e-mail. I checked my settings and they are the same as always - my e-mail address hasn't changed; the outgoing and incoming server information is the same. I went through the Troubleshooting steps and still nothing. Also it's taking a really long time to connect to check for incoming e-mails. Any clues on why this is happening or what I should try next? The e-mail is via Roadrunner does that matter (althoug it didn't a couple of days ago)

This message means that your outgoing email server is not letting you connect to send email. Maybe RR changed their policy. You should be able to send using home WiFi, but when using 3G RR will not allow connections from outside their network.
One easy way around this, is to use the built-in AT&T SMTP server for outgoing email.
Or, check the RR FAQs and see if they allow an authenticated account to send email - maybe you just need to add SSL and username/pwd on the RR outgoing email server settings.
BTW - this is asked almost daily - the "Search Discussions" box to your right would have given you many hits with the same answer.

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