This is the full list of custom AppleEvents supported:
Code:
Event Class Function
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SELE Select a list from the list pull-down menu
ACCO Select an account from the account pull-down menu
ADDF Add new recipient(s)
DELE Remove recipient(s)
SUBJ Set message subject
MSGC Set message body
FORM Set message format
PRIO Set message priority
ATTC Add an attachment
ATTE Set attachment encoding
SEND Send mail
CDOC Close Current document
NDOC Create a new document
SLIA Save current recipient list
SLIS Save changes to currently selected list
To delete all addresses try to select a list that doesn't exist.