Use a return address that does not identify you, if one is required
Send the letter from a public mailbox or post office
Do not include your name, phone number, email, or other identifying details in the letter
Avoid using handwriting that could be recognized
Type the letter instead of writing it by hand
Use plain paper and a plain envelope
Do not include personal details, references, or clues that reveal your identity
Pay with cash if mailing in person and anonymity is important
Remove metadata if sending electronically instead of by mail
Use a third-party mailing service if appropriate and lawful
Check local laws and postal rules before sending anonymously