I've caught several ISPs filtering entire blocks of servers lately, and without any reason being given. Our server is on the 77.235.32.0/19 block, from a highly respected European host (
EuroVPS).
In a few cases, I think all of 77.235.0.0/16 is being blocked. Maybe even 77.0.0.0/8!
Really, really stupid. That blackholes most of Europe. Talk about USA ISPs being xenophobic.
As such, I've had to add warnings to the forum sign-up page. See attached image. Apparently a lot of AOL, AT&T (sbcglobal.com), Earthlink/Mindspring, Comcast and MSN customers are not always getting their emails. Some do, some do not, and it makes no sense. BOL in Brazil is also guilty.
Gmail, Hotmail, Yahoo, Outlook.com, and your own hosted servers have no problems.
I'd like to thank forum member mcowen64 for bring this to our attention. Hopefully this warning can reduce confusion in the future. We've always known about ISPs diverting messages into spam folders, but it now seems they're blackholing certain address ranges entirely. No spammed emails, no bounce messages, nothing. That's very poor email practices on the part of the ISP. For shame!
