You can use a dedicated domain for your cold emails, this way, you'll protect your main domain. If you go this way, here are some important things to pay attention to:
- If you use a new domain with no emailing 'history' - make sure to start slow and increase the volume as you gain trust and replies.
- Pay at least 6 months of GSuite subscription ahead instead of paying monthly. People using the monthly plan reported that Google blocked their new domains pretty quickly.
- Make sure to forward your dedicated domain (e.g yourcompany.co) to your main domain (yourcompany.com). This way, when someone tries to get to your website using your email address domain, he'll not get to a dead end.
- Not a must but really handy - Try to reply to prospects who responded your emails using your main domain. This way the transition to your real email is smooth.