French phrase
Je peux vous contacter par ~.
Meaning
I was wondering if I could contact you by ___.
When to use it
A courteous way to ask permission to use a contact method. It is common in polite exchanges.
Example dialogue
Je peux vous contacter par mail.
I was wondering if I could contact you by email.
Bien sûr, voici mon adresse électronique.
Of course, here is my email address.