I had some trouble registering my Panera loyalty card, so I emailed their customer support. After a bit of back and forth I received the message below. For explanation, I own the domain name mindwire.org. When I sign up for accounts on web sites, I put in an email address of the form “www.website.com@mindwire.org”. This allows me to track where my email is coming from, since all messages to @mindwire.org come to me. This is a remarkably effective method of revealing how spammers get my email address, and blocking the offending address. This format has never been a problem before now…

Hello again Danny,
We’re sorry, but you cannot use the address members.mypanera.com@mindwire.org.

MyPanera is a trademark owned by Panera and you are not authorized to incorporate it into your e-mail address. Please cancel that e-mail address. Once you have retrieved your username and password, you can enter a new non-infringing address if you want by using the My Account/Edit My Info selection.

In the meantime, we are using [OMITTED] for your MyPanera account, the address from which you replied to my previous email. You will be able to retrieve your username/password using your [OMITTED] address.

Again, we’re sorry if this disappoints you, but we take the matter of trademarks seriously.