Transmital or Transmittal: How To spell?
The word Transmital is misspelled against Transmittal, a noun meaning "Transmission."
Transmittal has double "tt" is mispronounced as "t"Remember double 'TT' in between the strings transmi & al which should not be misspelled with single 'T'
Wrong Spelling:  transmi-t-al  Correct Spelling:  transmi-tt-al 
Find more wrongly spelled words of Transmittal to spell it well.