The XO help desk told me, "Mac Mail 2.1 does not support the ability to specify @domain.com as part of authentication on the SMTP server. It will work on the incoming mail server, but causes errors with the application when tried for an SMTP
XO The Girls was established in 1999. We have grown steadily and have become a premier resource for tablecloth and chair rentals. We cater to both clients and venues due to our extensive knowledge of the wedding and special event industry.