French phrase
Je vous répondrai ~.
Meaning
I will get back to you via ___.
When to use it
A polite way to state how a reply will be sent. It is slightly formal and common in professional exchanges.
Example dialogue
Pouvez-vous m'envoyer la confirmation par mail ?
Could you send me the confirmation by email?
Je vous répondrai par e-mail.
I will get back to you via email.