beletter

from The Century Dictionary.

• To write letters to; invite or inform by letter.
• To decorate with letters or with appended abbreviations of office or title, such as F. R. G. S., M. R. A. S., LL.D., etc.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• verb rare To add letters (indicating rank or education etc.) to one's name as little more than decoration