Hi Alexander, The process is roughly speaking as follows: 1) You send a message to one Freelists lists. 2) Freelists hold your message in a Queue while they send a short message back to your ISP which essentially says, "This IP address/number appears to have come from you, can you please confirm it's is one of yours". 3) If a confirmation message comes back from your ISP, your message is released. If not, it's dumped. In your previous message, it seems pretty obvious that not all BT's servers have been set up to allow this process. I don't know if you know anything about the "Ping" function, where you can Ping an IP address to see if it is active. These can be set up in such a way that a ping will be refused. It's Reverse DNS Lookup is a similar process, but very often set to be disallowed by default. George. -----Original Message----- From: access-uk@xxxxxxxxxxxxx [mailto:access-uk@xxxxxxxxxxxxx] On Behalf Of Alexander Shannon Sent: 05 March 2009 13:18 To: access-uk@xxxxxxxxxxxxx Subject: [access-uk] Re: Messages lagging was ] Re: Moderated status Hi George, By a DNS Lookup request, are you meaning the message I sent to the support team, the reply from which I sent to this list, or are you referring to the research the Internet Services gentleman said he would do? I ask this, as I'm not sure which part of the process is the actual request, and even if I knew I'm sorry to say I couldn't answer the question you've posed. Do you want me to ask Bt Broadband support the exact question you posed, or were you actually asking me? Alexander Shannon ** To leave the list, click on the immediately-following link:- ** [mailto:access-uk-request@xxxxxxxxxxxxx?subject=unsubscribe] ** If this link doesn't work then send a message to: ** access-uk-request@xxxxxxxxxxxxx ** and in the Subject line type ** unsubscribe ** For other list commands such as vacation mode, click on the ** immediately-following link:- ** [mailto:access-uk-request@xxxxxxxxxxxxx?subject=faq] ** or send a message, to ** access-uk-request@xxxxxxxxxxxxx with the Subject:- faq ** To leave the list, click on the immediately-following link:- ** [mailto:access-uk-request@xxxxxxxxxxxxx?subject=unsubscribe] ** If this link doesn't work then send a message to: ** access-uk-request@xxxxxxxxxxxxx ** and in the Subject line type ** unsubscribe ** For other list commands such as vacation mode, click on the ** immediately-following link:- ** [mailto:access-uk-request@xxxxxxxxxxxxx?subject=faq] ** or send a message, to ** access-uk-request@xxxxxxxxxxxxx with the Subject:- faq