If the writer and reader have not communicated lately, a sentence such as "I hope you are doing well" or "I hope you are enjoying this spring weather" is the US and Canadian equivalent of Bala's example. (I have emails with those opening sentences in my inbox.)
But “I hope you” sentences are not normally used in email to strangers. Those messages are likely to begin with "Dear" and the person's name, followed by a sentence about the reason for the email.