Can use dear for both mail and female

A common question!

In English, "dear" can indeed be used as both a salutation in formal letters and a term of endearment for a female person.

As a salutation, "dear" is often used in formal letters, emails, and other written communications to address someone in a polite and respectful manner. For example:

In this context, "dear" is a formal way to begin a letter or email, and it is not necessarily a term of affection.

On the other hand, "dear" can also be used as a term of endearment to address a female person, often in informal or affectionate contexts. For example:

In this context, "dear" is a way to express affection, fondness, or closeness towards someone.

It's worth noting that while "dear" can be used as a term of endearment for a female person, it's generally not used as a term of endearment for a male person. Instead, terms like "old chap," "mate," "buddy," or "honey" might be used in informal contexts.

Overall, the key is to consider the context and the relationship you have with the person you're addressing. If you're unsure whether to use "dear" as a salutation or a term of endearment, you can always opt for a more formal greeting or a more informal term of affection.