Use mail services

Modern web services allow it to mail out (physical) letters which have been printed through a special printer driver.

Those printer drivers generate the address a letter should be printed to by analyzing the contents of a page. The address for a letter should be printed into a fixed rectangle and any text in this rectangle will be used as address. If the program then prints the return address before the actual client address that address would be used - which is of course useless, since it is the same for all letters.

To avoid this problem that return address can be inserted as a TWPTextObject which uses the flag wpPrintAsBitmap in its RenderMode property.