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I corrected the title error a few hours after notification was sent out, but didn't change the error in the url?
Should I correct the URL, leave it as is or delete the article and republish it with everything corrected? Obviously, another notification would be sent to subscribers but the information would be correct.
And what about search engines that may already have indexed the page?
I'm new to using RSS so appreciate any suggestions.
I would suggest editing the RSS/Atom file to remove or fix the entry in question. You can't stop aggregators that have already collected the content, but it will help with anyone who pulls your feed from now on.
Is the incorrect URL an existing one on your site? If not, simply put a 301 Permanent Redirect in your .htaccess file to point to the correct location.