Robert_Charlton - 8:01 am on Feb 8, 2010 (gmt 0)
Even when I reply to an email?
Often especially when you reply to an email. I've run into a number of situations where emails would get kicked back because the return addresses had been set up as I described above....
That "@" character is an "illegal" character in user names, but apparently it doesn't affect senders... only those who reply to it.