A methylase that recognizes the double-stranded sequence 5'-CAATTG-3', methylates A-3 on both strands, and protects the DNA from cleavage by the MunI endonuclease. a 2'-deoxyadenosine in DNA + S-adenosyl-L-methionine = an N(6)-methyl-2'-deoxyadenosine in DNA + H(+) + S-adenosyl-L-homocysteine Belongs to the MT-A70-like family.