As long as the email address (or another recognisable link) is not part of an extended text you can escape recognition by entering a simple formula like ="My.Self@ourdomain.cosm" or even ="mailto:MySelf@ourdomain.universe".
As long as the email address (or another recognisable link) is not part of an extended text you can escape recognition by entering a simple formula like ="My.Self@ourdomain.cosm" or even ="mailto:MySelf@ourdomain.universe"..