Using groff version 1.23.0.rc1.235-633d.
Sample file:
.LT SP
.WA "John Doe"
Nowhere,
USA.
.WE
.IA "Jane Smith"
Somewhere,
UK.
.IE
.LO SJ "Letter of Introduction"
.LO SA "Dear Ms Smith"
.P
This is the text of the letter.
.FC "Yours sincerely"
.SG
Process with groff -mm -Tpdf
You'll find that: The subject line shows only the first word; the formal closing is omitted completely; and the writer's name at the bottom is followed by a trailing comma.
If you change the first line to
.LT BL
or one of the other letter types, everything is printed correctly.
--
Robert Goulding
Director, John J. Reilly Center for Science, Technology, and Values;
Director, Program in History and Philosophy of Science;
Assoc. Professor, Program of Liberal Studies,
Fellow, Medieval Institute,
University of Notre Dame.