We use aggressive (externally run) software which stops most spammers, but also some genuine users. This can be sometimes for requesting a simeple username (ryan, jon, timmy, william, security, etc), a shared IP which may have been flagged, or rarely the email address.
Please supply the following by email to firstname.lastname@example.org and we will add you manually to the sites.
Username (Callsign if you have one):
Confirmation you've read rules (below):-
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Also please read the fuller version of rules here http://www.hamradioforum.net/faq.php?faq=therules#faq_general_rules