Does my phone save email address to my contacts that I have replied to on sites like Craigslist?

[AC Question]

I have strange email addresses in my contacts that I didnt put in. I was wondering if my phone saves them on its own?

 

[B. Diddy]

Welcome to Android Central! Are you talking about the actual Contacts app, or does it just come up as a suggestion when you're entering an email somewhere?