> Maybe Brandon can weigh in on or off list, but is there a a way for
> spammers to simply relay out Gmail servers if they are Google Cloud?

$ host -t txt sredplus.com
sredplus.com descriptive text 
"google-site-verification=gyoD4DWS9XSrAmz9s5Pc9OBLvvowksBJtB0Oi-DAlsQ"
sredplus.com descriptive text "v=spf1 mx include:_spf.google.com 
include:24145163.spf02.hubspotemail.net include:sendgrid.net -all"

$ host -t mx sredplus.com
sredplus.com mail is handled by 10 alt3.aspmx.l.google.com.
sredplus.com mail is handled by 5 alt2.aspmx.l.google.com.
sredplus.com mail is handled by 5 alt1.aspmx.l.google.com.
sredplus.com mail is handled by 1 aspmx.l.google.com.
sredplus.com mail is handled by 10 alt4.aspmx.l.google.com.

I guess those two tell you everything you need to know: their email
infrastructure is Google, they're just using it for cold email^W^W
spam in addition to their regular stuff. This is really commonplace
these days.


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