<html><head><meta http-equiv="Content-Type" content="text/html charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class="">Hi,<div class=""><br class=""></div><div class="">To filter out the gmail etc, get all the hostname part of each email address. The hostnames where there are multiple email accounts signed up to the list are much less likely to be the culprit.</div><div class=""><br class=""></div><div class="">Hope that helps.</div><div class=""><br class=""></div><div class="">Andrew</div><div class=""><br class=""><div><blockquote type="cite" class=""><div class="">On 8 Feb 2016, at 17:37, Frederick Cheung <<a href="mailto:frederick.cheung@gmail.com" class="">frederick.cheung@gmail.com</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><div id="bloop_customfont" style="font-family: Helvetica, Arial; font-size: 13px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; margin: 0px;" class="">On 8 February 2016 at 17:16:02, Murray Steele (<a href="mailto:murray.steele@gmail.com" class="">murray.steele@gmail.com</a>) wrote:</div><blockquote type="cite" class="clean_bq" style="font-family: Helvetica, Arial; font-size: 13px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px;"><span class=""><div class=""><div class=""></div><div class=""><div dir="ltr" class=""><br class=""><div class="gmail_extra"><br class=""><div class="gmail_quote">On 8 February 2016 at 17:09, Beo<span class="Apple-converted-space"> </span><span dir="ltr" class=""><<a href="mailto:nick@beo.so" target="_blank" class="">nick@beo.so</a>></span><span class="Apple-converted-space"> </span>wrote:<br class=""><blockquote class="gmail_quote" style="margin: 0px 0px 0px 0.8ex; border-left-width: 1px; border-left-color: rgb(204, 204, 204); border-left-style: solid; padding-left: 1ex;"><div style="word-wrap: break-word;" class="">Does filtering out all gmail and other widely used domains get that 1500 count down a bit?</div></blockquote><div class=""> </div><div class="">Oh, that’s not a bad idea, thanks Nick. Maybe I only need to check godaddy domains - that should be checkable via whois, right?</div><div class=""><br class=""></div><div class=""><br class=""></div></div></div></div></div></div></span></blockquote><br style="font-family: Helvetica, Arial; font-size: 13px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px;" class=""><div style="font-family: Helvetica, Arial; font-size: 13px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px;" class="">Perhaps also see if the MX records for the domain contain<span class="Apple-converted-space"> </span><a href="http://secureserver.net/" class="">secureserver.net</a><span class="Apple-converted-space"> </span>?</div><div style="font-family: Helvetica, Arial; font-size: 13px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px;" class=""><br class=""></div><div style="font-family: Helvetica, Arial; font-size: 13px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px;" class="">Fred</div><span style="font-family: Helvetica, Arial; font-size: 13px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; float: none; display: inline !important;" class="">_______________________________________________</span><br style="font-family: Helvetica, Arial; 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