How to check mail address by using facebook account

You can't directly check someone's email address using their Facebook account. Facebook doesn't provide a feature to access someone's email address from their profile. However, there are a few ways to find someone's email address if they have publicly shared it or if you have a mutual friend who has shared their email address:

1. Publicly shared email address: If someone has publicly shared their email address on their Facebook profile, you can find it by searching for their profile and looking for the "About" section. Sometimes, people share their email address in the "Contact and Basic Info" section.
2. Mutual friend: If you have a mutual friend who has shared their email address, you can ask them to share it with you. You can send them a message on Facebook and ask if they know the person's email address.
3. Facebook Groups: If you're part of a Facebook Group where the person is also a member, you can ask the group administrators if they have access to the person's email address.
4. Email search engines: There are some email search engines like Pipl, Whitepages, or Spokeo that allow you to search for people's email addresses. However, these services may not always have accurate information, and it's essential to respect people's privacy and not use these services to harass or spam others.

Remember to always respect people's privacy and only use their email address for legitimate purposes, such as contacting them for a specific reason or with their consent.