I saw the other post by someone having this issue. Trying to login to the mail parser through my zapier login. I click authorize and it goes to a 404 page.
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Hi there
Welcome to the Community! 
This is certainly an unusual issue. To troubleshoot, could you please try logging into the Parser using an incognito window on your browser? Sometimes, the browser cache can interfere with the sign ups.
Here's a detailed guide on Setting up your Email Parser account in Zapier for your reference.
If you're still encountering the same problem, it would be helpful if you could provide us with a full-page screenshot (including the browser URL) of the page where you're seeing the error. This will help us better understand the issue.
Hello ken.a, I tried connecting again today and it went through fine. I’m not sure what the issue was last week but it seems to be working now. Thanks for your response!
That’s great news
If you have any other questions, please don’t hesitate to reach out to the Community. We’re always happy to help! 
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