Does PSM also support TrueType Fonts?
Check the availability of the fonts on your computer in PSMails fontlist.
PrintShop Mail for Mac supports PostScript fonts and TrueType fonts. In most cases it will print correctly. PrintShop Mail just tells the Driver to use that font. If the output to file shows OK in Acrobat Distiller, the same result should be reached on the printer.
If PrintShop Mail uses a TrueType font for example Times, that font may be replaced by the printer by the PostScript Times which may lead to slight differences in output.