Does Cloudflare block ProtonMail?

[user15990]

While dealing with the headache of ticket #2336045, I’ve tried to respond (via email) by replying to a couple emails and it seems as though my email specifically, or more likely, my email provider protonmail.com seems to be blocked by the [email protected] email I am being told to reach out to. It seems that every time I try send a message I receive an email from: “[email protected]” with the subject: “Delivery Status Notification (Failure)”, with it saying (among the technical gibberish):

“Your email to group [email protected] was rejected due to spam classification.
The owner of the group can choose to enable message moderation instead of bouncing these emails.
More information can be found here: Messages from a bulk sender bounce - Google Workspace Admin Help”.

How do I deal with an issue if I’m supposed to email support and the message will not go through?

[thedaveCA]

I get the same thing here when sending from a @protonmail.com address, I’ll pass this report along.

[sdayman]

I have at least five email messages successfully sent to @cloudflare email address this month from my @protonmail address. The most recent was on December 22.

Does the bounced mail happen to show your original messages full headers with a spam score?

[thedaveCA]

Only from Protonmail itself, I think:

X-Spam-Status: No, score=-1.2 required=10.0 tests=ALL_TRUSTED,DKIM_SIGNED,
DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,FREEMAIL_FROM,HTML_MESSAGE
shortcircuit=no autolearn=disabled version=3.4.4
X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on
mailout.protonmail.ch

Otherwise I don’t see any obvious clues in the headers.

[user15990]

So far I have not noticed anything particular about the message that has not already been stated, however the issue seems to persist since this has first since posted.