[Mailman-Users] Are messages queues in the face of SMTP failures

[Robert Bannocks]

I have just mass subscribed 300 people to a list, unfortunatly I
selected wrongly the "Send welcome messages to new subscribees?" and
"Send welcome messages to new subscribees?" options
resulting in 600 notices being prepared.  Fortunatly I had shut downt
the SMTP listner. 
 
My question.  Will mailman queue or re-create these messages, if so how
can I stop them being sent out as they are not required.
 
TIA and regards.
 
RB