changing point size in the mm letter macros

[lawler]

I am using the groff_mm letter macros to write business letters.
12 point type is easier to read.  When I use the .S 12 macro,
all the type is changed except for the writer's and recepient's
addresses.  The code that I am using now to change all the type is

.S 12
.ev address@hidden
.ps 12
.vs 14
.ev

It seems like it should be easier.

Thank you for the wonderful software.