Once upon a time, Grant Taylor via NANOG <nanog@nanog.org> said:
I am having problems sending email to GMail from my new (< 2 weeks old) Linode VPS.
May not be the case here, but I had an issue with my Linode and IPv6 email (not with gmail.com though). If you just "request IPv6", you get a single /128 out of a common /64. The problem is that most people doing IPv6 anti-spam treat reputation on at least the /64, not individual /128s. You can request a /64 from Linode, no additional charge. I switched to using my own /64, and I haven't had any issues since. I use Lynx to look things up in Google sometimes, and was also periodically getting blocked from that (with a captcha!). Since switching to my own /64, I haven't had any issue there either. -- Chris Adams <cma@cmadams.net>