For me, it's not the check, it's the emails. I would expect to have emails and calls from at least 3 people at the company - HR, Hiring Manager, and Team Manage

For me, it's not the check, it's the emails. I would expect to have emails and calls from at least 3 people at the company - HR, Hiring Manager, and Team Manager. Also, companies are terrified of being sued, that's why they require all recruiting and hiring emails to be done on the corporate accounts. If they don't require HR and managers to use corporate email, that's a big red flag too