Here's why:
* The vowel "a" in "address" is a short vowel sound. It sounds like the "a" in "cat" or "hat".
* Long vowel sounds are usually marked with a silent "e" at the end of the word. For example, "gate" or "bike".
* The "e" at the end of "address" is not silent. It's part of the final consonant blend, which is pronounced as "ess".
Therefore, "address" has a short vowel sound, not a long vowel sound.