For my mail, I use several catch-all accounts, so I can give every service it's own email address, which proves very useful in creating automatic rules. There is one issue though, you have only one sender account, and some services require that you respond from the original send-to address. To manage such 'virtual identities', Thunderbird allows you to write your own from address. Mail.app however, does not have such a setting. After several Google attempts, today I found *the* solution: the 'email address' field in Account properties, allows a comma separated list, allowing you to specify multiple addresses. Quite a genius way of solving the issue, if you happen to know this. Full credits go to Jonathan Tron who wrote the solution on his blog, together with some images. Thanks Jonathan!

~RW