Gord, Wow wow wow! thank you. I think that's why I am confused and now I get.

"Text" can be countable or uncountable, depending on the meaning. It is uncountable if you are talking about words and sentences in general, but it is countable if you use "text" to mean an entire article or book, or a text message sent on your phone. "Mail" is not countable. However, "e-mail" can be countable or uncountable, depending on the meaning. It is uncountable if you refer to "e-mail" as an app or a system, or all of your e-mails together: "I never check my e-mail on weekends." It is countable if you use "e-mail" to mean an e-mail message: "I sent him two e-mails but he says he didn't receive them." "Message" is always countable.

Karen Degraeve, Thank you so much!

two texts, two e-mails and two messages: countable!