SQL command to delete a single email message from database

hello there ;-)

retrieved this error yesterday from dbmail-util that it can't retireve 
the email message

Aug 04 23:11:01 ex4 dbmail-util[9554]: [0x1108890] Error:[message] 
dbmail_message_retrieve(+1108): retrieval failed for physid [172134]

even a dbmail-util -ay isn't able to fix this error

so how can i completely remove the email with physid[172134] from the 
database in phpmyadmin via an sql command?

or what would the best way be to repair this issue?

thanks & all the best
becki