I'm looking at a bunch of URL crawl errors in google webmaster tools. But they were all detected over a month ago, which was the last time I had updated my sitemap.xml in GWT (I switched servers and forgot to set up regular updates again).
I restructured the website and have a new sitemap that takes care of all of the outdated URL errors. The sitemap no longer points to pages that aren't there. Or at least it appears that way. I don't want to go through and check each one.
If I "mark as fixed" but it's still a broken link will GWT find the broken link the next time it checks and alert me again? Or will the broken link forever be passed over?