David, did you try chipmaker's driver?

Fix a channel to 6 on MR3420 and reconfigure WA830RE to see what happens.

You misunderstood VLAN feature of WA801ND. You want to know more? Click http://www.tp-link.com/en/article/?faqid=418. What you need seems like guest network feature but it is not supported by WA801ND.

Username is the one typed in From: ? How did you figure out SMTP server? Not sure if gmail works but I'm using a different one now.

WR720 is configured in WDS mode? Wireless Connection to hot spot directly works fine? How about other wireless clients?

In one of screenshots, WAN IP displays as 10.9.1.99. Copied from http://en.wikipedia.org/wiki/IP_address#IPv4_private_addresses. IANA-reserved private IPv4 network ranges Start End No. of addresses...