My question involves a child custody case from the State of: Flordia and Georgia

I have a couple of quesions regarding phone and email contact that I can find an answer to online. my ex has recently, within the last three to four months, started exercising his regular visitation rights. In the past 6 years since our divorce he has not seen the kids like was alloted in the court order due to his work being active duty military and because of his own personal choices and reasons. I am all for his seeing the kids like he is supposed to and that isn't my issue. My issue is that in a phone call yesterday he said that he read all the emails that one of my daughters and I have been sending back and forth and he doesn't like what I said so now he is saying that while the kids are at his house I am not allowed to contact them by phone or email at all. I have never denied the kids the right to email or phone their dad except when its during school, church, dinner, or at bedtime. Im not sure if they have his email address or if he has theirs. What he told me is that I don't have the kids call him when they are home so he isn't going to let them call me when they are at his house. My kids have callled and emailed in the past and he has not answered or never called back so they stopped trying. He sees phone and email as its the kids responsibility to call him not his to call them. The children are ages 12, 10 and 8. He states the paper says he gets 2 weeks uninterrupted summer time and that means I can't contact the kids at all but when I said the papers say i get the same time he said no you don't because they live with you. I can't find anything on exactly what uninturrupted time is other than two weeks stright with no back and forth between houses. I even said I wanted to do that for the full summer time which is 5 weeks each because weekends are the only time when anyone can paln anthing because everyone works except him. I don't call the kids or email them when they are they I only answer calls and emails when they initite the contact.
My questions are
1) can he legally read all the private emails sent between me and he kids?
2) can he legally deny them and me and te kids the right to talk to each other either by phone or email when they are at his house?