sp_send_dbmail blocked and waittype is preemptive_os_getprocaddress

This will happen if you use user transaction when calling sp_send_dbmail. Do not call sp_send_dbmail with in user transaction.If you open a transaction and
send a mail with some attachment in first connection and dont commit . Open a second connection and send a mail using sp_send_dbmail it will not be queued and wait
till the first connection commits.You will also see preemptive_os_getprocaddress wait for second connection

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