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When addressing an envelope for optical character recognition (OCR), it is important to avoid certain formatting elements that could interfere with the machine's ability to read the address accurately. Punctuation marks can pose challenges for OCR because they may be interpreted incorrectly or be missed entirely by the scanning technology. This can lead to misrouting or delays in mail delivery. By omitting punctuation, the address becomes clearer and easier for OCR systems to process.

In the context of addressing an envelope, using capital letters is typically recommended as it improves legibility. Colorful ink may not be ideal for OCR because it can affect the contrast and clarity of the printed text, but it's the punctuation that is especially critical to avoid. While handwritten addresses are usually discouraged for OCR purposes due to their variability in format and potential for errors, the primary concern directly related to OCR function is the presence of punctuation marks.