How do you politely confirm?
Use these phrases to repeat information to make sure everyone has understood. Let me repeat that. Let's go through that again. If you don't mind, I'd like to go over this again.
How do you respond to check and confirm?
Anything along the lines of “I have received the mail ” or “ I confirm that the e-mail has been received and read ” or “I have received the email . I will correspond/be in touch with you shortly , thank you ”will do fine .