SMTP server not responding to requests in a timely fashion SMTPRA does not respond in a timely fashion and/or the connection times out. Problem: There could be many reasons why this may be happening but commonly this is a known issue if you have the option checked within your SMTP-Security window within MailSite to: "LookUP SMTP Hosts in the Real Time Black Lists" Explanation: This is caused due to a network delay or bottleneck from your site to the RBL servers. For every inbound connection to your server, MailSite will then make a new connection out to the RBL server to verify the host that connected to your site is not on the known Black list. While MailSite tries to reach the RBL server(s) all other incoming connections will be stuck like in a traffic jam until the bottleneck clears. Solution: Simply un-check the option to use the RBL servers. This is just temporary, you should be able to re-check the box and use the RBL servers at a later time when the network delay has been corrected.