AliExpress does not allow sellers to check the buyer's email directly. The buyer's contact information can only be communicated through the communication tools provided by the platform, such as in-site messages, chat tools, etc. This is to protect the buyer's privacy and information security, and is also the platform's regulations.

If you need to have a more in-depth communication with the buyer, you can ask the buyer whether he is willing to provide email and other contact information, but this requires the buyer's consent.

Sellers should abide by the platform regulations, not violate regulations, and protect their own and buyers' rights.