Can you mail a letter with red ink

In the United States, the United States Postal Service (USPS) has specific guidelines for mailing letters and packages. While there's no explicit ban on using red ink on letters, there are some considerations to keep in mind:

  1. Red ink may not be legible: Red ink can be difficult to read, especially for people with visual impairments. If the ink is too bright or overpowering, it may not be easily readable by postal workers or recipients.
  2. Red ink may be considered "additional matter": The USPS considers "additional matter" to be any material attached to a letter or package that's not part of the original contents. If you use red ink to add a message or decoration to a letter, it might be considered additional matter and could incur additional postage costs.
  3. Red ink may not be compatible with postal sorting machines: Some postal sorting machines use optical character recognition (OCR) technology to read addresses and sort mail. Red ink may not be readable by these machines, which could cause delays or errors in the mail processing.

That being said, if you still want to use red ink on a letter, you can do so, but be aware of the potential issues mentioned above. Here are some tips to minimize any potential problems:

Remember, it's always a good idea to check with your local post office or the USPS website for any specific guidelines or restrictions on using red ink on letters.