Hi @LGayazetdinova. From experience, I’m more likely to engage with a professional email. If your request to collaborate comes from a gmail or other personal provider, I’m going to think you’re not a legit professional. It may be unfair, but I would make an educated assumption that even freelancers would have their own business email rather than a free personal email.
Of course I’m assuming your question is referring to these free emails. So if you’re talking about a freelance personal-but-professional handle, then that may work well.
Also, depending on the industry, humor or helpfulness may work well. The few times I’ve worked with someone it’s been either because they’re helpful (“I noticed this link in your article goes to an outdated or broken resource, here’s ours that’s great.”) or funny.
I hope that helps!