Joseph Duggar looks like he’s got a super supportive wife … because he was emailing with Kendra Duggar after getting locked up on child molestation allegations … and they talked religion and music.

In new legal docs, obtained by TMZ, there’s an email exchange between Joseph and Kendra, his wife of over 8 years as well as the mother of his 4 children.

Joseph was first to reach out, emailing Kendra on March 23 from an Arkansas jail, saying … “hopefully this finds you well. love you sweetie!

Joseph replied the next day, apparently after talking with her on the phone, writing … “great talking with you today! i always love getting to hear your voice! hope you have a wonderful grade filled day! and in psalm 54 thats the one i am praying over each of you and replacing the personal pronouns with your name! that passage has brought me great comfort! all of the psalms that have meant a lot to me are 8, 18, 54, 86, 91 119 and 139. listen to them if you get a chance. maybe in song form if needed;) love u so much!

Kendra told responded, “It is good to talk to you! Love you!!”

Joseph continued the conversation with a “Megan Woods song, “The Truth,” which she says is Joseph’s favorite song.

The lyrics are interesting … “I don’t belong to the lies / I belong to you.”