Tips for writing a letter requesting an autograph:
Be brief but personal; don't just say "send me an autograph"
Use proper titles: Dear Mr. or Dear Mrs., Miss, or Ms., Dr., etc.
Check for spelling and grammar errors
Explain why you are writing. If you want more than one, state why
Typed or written is a matter of debate: if your handwriting is bad, type.
Always enclose something to sign
Always enclose a SASE (Self-addressed stamped envelope)
Always make sure the return postage is sufficient
Use Airmail stickers or stamps for overseas mail
Always hand sign your letter; it's more personal
Don't send to people who's work you don't know or admire; they will see through it
Requesting an autograph via email is no different than writing a letter. Always send a SASE, something to sign and follow the same procedures in email that you would in a letter.
Tips for writing a letter of complaint:
Maintain proper grammar and spelling (use your spell/grammar checkers)
Be polite and not too aggressive
Be very specific (use times, dates, places, names)
Enclose proof like photos, receipts and notarized statements
Always sign your name as you legally should. (Full name)
Make it short and to the point
Reread before sending or have others read it