Question about mailing inmate

Some prisons provide inmates with a certain amount of stamps every month, but most inmates purchase stamps themselves inside the prison. So no, you don't have to provide them with a stamp :)

Thank you

Is there a limit to how many emails i can send? And when i send an email to an inmate will he receive my address tk write back, or do i have to include my address in the letter.
Do i have to pay to send an email to an inmate

If you use Jpay/corrlinks/connect network (gtl) or any messaging service you would be paying the price of a forever stamp approx (may be cheaper). These are not free services.
If you are using the email service through write a prisoner website I believe it is free however this is for initial contact not regular ongoing mail.
The inmate will need your address to reply back only if he is unable to use the messaging services (jpay/corrlinks etc). States such as Texas don't tend to let inmates send outgoing jpay but they can receive them. Therefore they need an address to reply back.
Jpay: Since this is California we are talking about then they don't need your address unless your happy for them to have it or wish them to send the odd snailmail to you. That's personal choice. You do need to have inmate added to your contact list. They can not initiate contact otherwise.
Writeaprisoner Email: the only way they can contact you is if you add your address.

Yes, I have found the best way is through JPay. When you register with JPay the email are sent to the facility then a hard copy is sent to the inmate. Write a prisoner is a great way to get started and JPay is a great way to send correspondance. But it is not free. I pay with JPay stamps to send email and the inmates write me handwritten letters, just like we all did back in the day. Hope this helps.

Personally, I never did Jpay or corrlinks or any other email provider as a starter. It's too fast. I prefer building things slowly, but surely. ;-) Bit old fashioned? Yeah, perhaps. But sending jpay back and forth is a quick jump-in which might easily buid expectations, like being able to write every day, for example. I definitely avoid these, at least in the beginning.

TX is another thing, there they can get Jpay, but it's only one way messaging and they have to write via snail mail.

Yes, put the stamp in the envelope.