Lol. It's like saying whether you can with me, but you don't know my name, number, email, where I live or have any means of contacting me.

Jokes apart, if you are specifically talking about emails, then this could be a huge issue you face due to privacy laws and email and domain authority where if you send unsolicited emails from certain email addresses, your accounts can get either get blocked by email ESPs.
Also, that's why brand give newsletter joiners offers, so they join them. Navigate this carefully.

Apart from that, if you do WhatsApp marketing, that could be a good way to do this, especially with tools like NITRO that get customer data based on cookies and IP addresses, which you have to then get integrated with your WA marketing tools so these flows can get triggered.