Which business email address should I use to sign up for all of my business accounts?

I'm a part of a startup. I'm confused about which email should I use to sign up for all business accounts. admin@companyname.com or username@companyname.com? 'Cause the employees are ever changing, it's unfair to use a user-based email address.

submitted by /u/abhishekpatil9630
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source https://www.reddit.com/r/Emailmarketing/comments/egj4ax/which_business_email_address_should_i_use_to_sign/