I have been sending and receiving mail happily since I got my new Mac Pro. However, today, it's started to give me an error when I try to send an e-mail. The error I get in Mail.app is "not our customer". I changed no settings prior to getting this message and comcast has stated that they think it's a problem with the computer. I've rebooted and checked my settings, and they seem to be in order. Any one have any thoughts?
repair permissions, run disk utility, run diskwarrior. Put mail prefs on desktop (without Mail being open) and re-open mail and reset any necessary prefs. Failing that, possibly archive and install but hopefully somebody can add other steps before resorting to archive and install.
it turns out that it's a crazy error message that makes you think that you are not a customer, when in reality it's suggesting that the person you're sending it to is not a customer. So, the error message itself is a bit misleading. Not sure who wrote that one up, but it's ********.
How odd. I have a similar problem with comcast and mail on a secondary machine on my LAN since upgrading to my new AE router from my old Macsense router.