Sending domain question. Which do I use?

What’s best practices for sending domains?

Do you a sub domain of your primary domain (eg email.companyname.com)?

Or do you take out an entirely different domain (eg companyname.net or company-name.com)?

Thanks.

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source https://www.reddit.com/r/Emailmarketing/comments/ia6i2f/sending_domain_question_which_do_i_use/