Hello there! If there is a justified order in this case, you can share your email.
However, I believe it would be best for you to open a Google Ads MCC Manager Account to manage access to accounts from one place.
The best way to work with many customers is not to share your email, as you have a limit of 20 accounts per user in Google Ads, and you will get stuck in the future if your business is growing.
You should request the customer's account ID (000-000-0000) and send them an access request from the MCC you created.
The customer will then receive an email with the access request. Alternatively, you can simply explain that they will find the request in the following location: Tools and Settings > Top Menu > Access and Security > Top Left Menu "Manager" > This is where they will find the access request.
Here is the knowledge base of Google Ads regarding how to create a Manager Account:
https://support.google.com/google-ads/answer/7459399?hl=en
I hope it can help 🙂 Have a great day!