Updated pear/mail from 1.6.0 to 2.0.0
Change-Id: Ice89888216220612bae0f5597e2bbde9b9bd3bf1 Depends-On: I19d29ef502f4647da6a2249180bdc9f612335085 (cherry picked from commit 80f352656364e5ec769fb8e1868499980e15b2ff)