If just you did it, no. If enough people did it, then (b) yes, but (a) maybe, not necessarily.
But enough guysplaining, what about the email? Weird! Is it actually addressed to multiple people, firstly? Is "Gents" like the old fashioned "Sirs" when writing to unknown recipients at a business? Has it been written by someone whose first language is not English but learnt English in a very formal, old skool style? Or is "Gents" intended to be chatty and breezy? I'd say it's a bit odd even if all the recipients were male.