SQL Server sp_OACreate fails (out of memory condition)

After successfully sending cca 250 e-mails I have error:

    DECLARE @hr int
    DECLARE @sTmp0 nvarchar(4000)
    --  The mailman object is used for sending and receiving email.
    DECLARE @mailman int
    EXEC @hr = sp_OACreate 'Chilkat.MailMan2', @mailman OUT
select @hr -- -2147024882
select @mailman -- null

The solution is to call sp_OADestroy when finished with each of the ActiveX objects 
For example:

EXEC @hr = sp_OADestroy @mailman
EXEC @hr = sp_OADestroy @email