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That's why I created a startup with no website, it's called guerillaclick@gmail.com, it's a credible domain (you don't say) and it will click on any "verify" links you send it to it.
You can use aliases to get around of duplicate emails in the target system, so like
guerillaclick+eralp@gmail.com guerillaclick+sdfaskdma@gmail.com guerillaclick+111@gmail.com
so choose an alias and start using the service!
I will provide a website to see the inbox of your alias. (maybe for services who send your pw in the email, but then you might be better off using other established servers.)
Gmail API is a bit slow so it might take 30 seconds for email to be received on my end, keep in mind while testing!
Best,