CL_BCS is that working background?

Hi,

I was using old methods like : SO_NEW_DOCUMENT_ATT_SEND_API1, but i can not set mail receivers sequence list.It always sending with alphabetically..

Now i want to use this CL_BCS to sent new mail according to :

Is this sending method will work backgorund?I mean this will not trigger by user, that will work background.

Thank you.

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