Peter N. M. Hansteen asks the question, "Does Your Email Provider Know What A "Joejob" Is?" in his blog and provides some data and discussion. He provides anecdotal evidence which seems to indicate that Google and possibly other mail service providers are either quite ignorant of history when it comes to email and spam, or are applying unsavory tactics to capture market dominance.
[Ed Note: I had to look up "joe job" to find out what it is. According to wikipedia:
A joe job is a spamming technique that sends out unsolicited e-mails using spoofed sender data. Early joe jobs aimed at tarnishing the reputation of the apparent sender or inducing the recipients to take action against them (see also e-mail spoofing), but they are now typically used by commercial spammers to conceal the true origin of their messages.
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(Score: 0) by Anonymous Coward on Monday April 25 2016, @01:57AM
Hey jack-off!
All the major email services now verify spf/dkim/dmarc. They don't necessarily process that information identically, but they all use it as part of their anti-spam process. So climb under whatever rock you live under and keep your trap shut in front of your betters.
(Score: 0) by Anonymous Coward on Monday April 25 2016, @02:18AM
You must love spam since you feel the need to process the hell out of your messages to keep that Spam Message Transport Protocol alive.
(Score: 2) by maxwell demon on Monday April 25 2016, @10:13AM
So what do you propose a replacement should look like?
The Tao of math: The numbers you can count are not the real numbers.