I know we cant talk with non-mahram but the fact is when we are studying at a college its however impossible so we are advised limit the communication to only what is important and other things like joking around is not allowed and avoid.
My question is, what about sending an email which is intended to everybody in the email contact list ? or forwarding a text message which has any special dua or a reminder ? only for a religious purpose ? also this can be related to sharing a religious post in a facebook group which has wide audience (males, females non-mahram to each other)?
if all of the above is allowed? will a muslim women be allowed to do dhawah by spreading islam in a social gathering where both male and female is sat together ?