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Re:My account is sending spam emails by massaman_yams on Sunday April 22, 2018 @04:26PM (#16898384)
Re: others forging your domain by using Gmail - this is only true in narrow edge cases like this one (which appears to have been relatively quickly fixed by Gmail).

In practice, the Gmail and G suite UIs provide enforcement mechanisms to ensure you own a domain/address before allowing you to send from it.

Does it potentially open you up to spoofing if another loophole/exploit like this is discovered? Sure. But as risk factors go, depending on who you are, that's probably relatively low on the list.

Re:My account is sending spam emails by herbst on Sunday April 22, 2018 @05:45PM (#16898775)
Adding to this. You can only use Gmail for sending with your own domains when you have 2FA enabled.
Re:My account is sending spam emails by innocenat on Monday April 23, 2018 @06:08AM (#16902021)
Not really. It also works if you also lower your account security setting to low to enable 'Less-secured app' to login.
Re:My account is sending spam emails by herbst on Monday April 23, 2018 @06:50AM (#16902179)
Sure that is still available? Pretty sure this is disabled for a few years now. At least it was when I checked last time.