mySQL host connect error

My host requires an @ in the username and it appears to be somehow not
working with mySQL Admin.

When I type my username as sql:

[MySQL][ODBC 3.51 Driver]No '@' was found in user string (sql)
Disconnecting

Why I type my usename as sql@xxxxxxxxxxxxx which works when I telnet in and
connect I get:
[MySQL][ODBC 3.51 Driver]Domain (sql@) not found
Disconnecting

When the username is @carpetdye.com:
[MySQL][ODBC 3.51 Driver]Access denied for user:
'@carpetdye.com@xxxxxxxxxxxxxx' (Using password: YES)

Is this an incompatibility with using an @ in mySQL's username field?