Do Not Reply
At Intinno, we previously used to send mails for announcements of the course from the email id – contact AT intinno.com. But soon we realized that people are replying to that mail address to contact to thr professors. Using the id of prof. is not always a good idea (See, it’s illegal to use someone else’s email address to send mails). So, quite obvious, the solution was to send email from noreply AT intinno.com (well, unfortunately thr are some students who still don’t understand that they do not have to reply on that email address.)
Anyway, many of the companies act smarter/foolish/ignorant by not even sending mails from their domains. They send it from donotreply.com’s domain :D.. So the users will receive mail from donotreply@donotreply.com .. or .. something like intinno@donotreply.com, which in turn hogs up donotreply’s mail spaces. Owner of donotreply domain shares some of the funny mails that ppl sends to him when companies uses his domain in the reply-to address field here.