Hi, Well, i'm not sure but i think so. It is happening after that 100,000 emails are sent. And also, it won't happen at the moment of email sent out. It will happen after 2/3 days of email send out. As i already give you the min pool and block time out above,can we increase over that i mean we already have 300 min pool size, is there the limitation. Thanks. Milan Gothe View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4174601#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...