Are you sure that it was Sendgrid that blocked the message ? Looks to
me as if ab...@sendgrid.com is hosted at gmail and it was *gmail* that
objected to the content ...
Or am I misunderstanding something ?
No, of course you're right.
But forwarding an abuse address that is somewhat expected to receive
problematic content to a service that tries to keep such content out of
their users' mailboxes doesn't really look very professional, and even
if it isn't technically Sendgrid who perform the filtering this approach
has the effect of putting a content filter on the abuse mailbox.
Actually Sendgrid uses a double filtering: the first line of the error
report you got ("The original message was received at Fri, 22 Jan 2021
05:45:50 -0800 from m0099904.ppops.net [127.0.0.1]") means that the mail
has been received and processed by Proofpoint, that forwards it to Gmail.
See also their MX records:
$ dig +short -t mx sendgrid.com
10 mxa-0023de01.gslb.pphosted.com.
10 mxb-0023de01.gslb.pphosted.com.
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