You can receive email messages from your email accounts on your Apple Watch. To read an email message, your Apple Watch needs to be connected to your phone.
Press the Digital Crown.
Press the email icon.
Press arrow left.
Press the required email account.
Press the required email message.
Press Reply.
Press Add Message.
Press Add Message and record the message.
Press Done.
Press Send.
Press Reply.
Press Add Message.
Press the required quick reply.
Press the Digital Crown twice to return to the home screen.