You are given a sentence in Persian. Your job is to translate the Farsi sentence into English.

ولی این روش مشکل دارد ، آن هم این است که سرور های ایمیل کلید رمزگذاری را نیز دارند ، و شما یک قفل بزرگ و کلیدی در کنارش را خواهید داشت.

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
But there's a problem with this, and that is, the email servers also hold the encryption keys, so now you have a really big lock with a key placed right next to it.