Well, it is not, especially when you are a part of an organisation that has clear demarcations between, administration, support, marketing and sales teams.
It is because, emails sent from one department or an individual might be marketing or sales oriented but the feedback can be received by a concerned department which regularly looks into such contents concerning doubts.
You can also opt to go for the same sender address and 'reply to' address if you want to maintain a more static two-way communication. Make a thoughtful decision based on your business and give way for better communication.