Is yahoo mail .com or .co.uk

The answer is... both!

Yahoo Mail is available in multiple countries and regions, and the domain name may vary depending on the location. Here are a few examples:

• In the United States, the default domain for Yahoo Mail is yahoo.com.
• In the United Kingdom, the default domain for Yahoo Mail is yahoo.co.uk.
• In Canada, the default domain for Yahoo Mail is yahoo.ca.
• In Australia, the default domain for Yahoo Mail is yahoo.com.au.
• And so on...

So, to answer your question, Yahoo Mail can be accessed at both yahoo.com and yahoo.co.uk, depending on your location and the domain name associated with your account.