Sendmail Error: Urgent!

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Declare @filename char(22)
Declare @cmd char(100)

Select @filename = '"' + 'D:Feedsest_' + substring(convert(char(12), getdate(), 12), 3, 4) + substring(convert(char(12), getdate(), 12), 1, 2) + '"'

Select @cmd = "xp_sendmail @recipients = 'test@test.com'

, @attachments = " + @filename + " "

exec(@cmd)

Go
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Above T-SQL step is causing the following error:

Server: Msg 103, Level 15, State 7, Line 6
The identifier that starts with 'xp_sendmail @recipients = 'test@test.com'
is too long. Maximum length is 128.

Any help??Thanks.