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Re:Gmail's Second Major Problem by DangerousPie on Thursday January 24, 2013 @03:25PM (#5111970)
Looks like Greylisting to me: https://en.wikipedia.org/wiki/Greylisting
Re:Gmail's Second Major Problem by boogah on Thursday January 24, 2013 @04:03PM (#5112196)
Yep. I used to work at DreamHost and our customers would run into issues with Gmail greylisting incoming mail. In fact, they do it like crazy.

In a lot of cases, adding an SPF record for the sending domain would clear things up.

Re:Gmail's Second Major Problem by UnoriginalGuy on Thursday January 24, 2013 @04:12PM (#5112246)
It is disturbing how many DNS/domain hosting companies still have zero support for SPF.

It is A, MX, CNAME, and MAYBE a couple of other common record types. But a TXT record? No chance...

I had to move to Route53 just for this functionality.