myemail at y#hoo d0t c.om
or
give the seller your phone # such as:
txt me at:
123?
456?
7890?
And then text them your email.
Chances are attempts at disguising emails/phone #s would get by ebay but if not, that’s a good way to get kicked off the site.
With a phone number you can spell out the numbers. Nine...One...Nine Two...Three...Two, etc.