Quoting myself for an update because, to some extent, I believe they are manually sent/handled. I FINALLY received my 2nd link, but only because I requested they specifically copy/paste it into our "contact us" email exchange that we had going. I discovered in January that this was the only way I could actually receive it if it is more than one registration link being sent by runDisney. If they would put both registration codes in the same email, I do not believe I would have an issue. I use Hotmail and evidently, it kicks out duplicate emails and I never receive it no matter how many times they resend the direct registration email. I did not ever receive a 2nd runDisney registration link in January or this time when they told me they resent them.
What's maddening is that I know this and the copy/paste has worked for two CrD registrations but I still have to call, email, send a carrier pigeon, and wait 4 days after the initial opening day for them to send me the link...after they inquire if I've checked my spam folder.
Thanks for letting me vent. I'm sure I'll be back at the next registration opening