Can i have the replyto email be someones email outside of our company? We would like to send an email on behalf of a wholesaler. I am guessing i shouldn't make the "from email address" theirs but wondered if having the replyto email theirs would cause any issues?
You can use any address for the "reply-to" or "from" email addresses. Just know that this could negatively impact your deliverability. Ideally these addresses should share the same domain as your tracking/sending domain.