More email variables

[suvozy]

_to_email                 lynnmathew@example.com
_to_email_username        lynnmathew
_to_email_domain          example.com
_to_name                  Lynn Mathew
_to_name_first            Lynn
_to_name_last             Mathew
_reply_to_email           suvozit@rime.co
_reply_to_email_username  suvozit
_reply_to_email_domain    rime.co
_reply_to                 Shubhajit Saha
_reply_to_name_first      Shubhajit
_reply_to_name_last       Saha