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Comment by ClashTheBunny | Hacker News Reader

There is a threshold for spammyness that will cause email to be dropped silently and never reach the spam folder.

I'm skeptical this is true. Is there any documentation or other evidence for this?

https://productforums.google.com/forum/#!topic/Apps/l-TmEzzF...

I read that forum rant and the linked content, and there is still no evidence that Gmail is deleting emails immediately by default. I read two possible causes:

- Content Compliance setting (managed by admin) that can prevent emails from reaching inbox

- Some other service, such as Exchange, which can somehow interfere with Gmail?

Specifically, the article mentions a "quarantine" folder that is not part of Gmail. Or am I missing something?

The quarantine folder you mention is part of the content compliance settings. Mail that matches content compliance rules goes into a quarantine that only admins can access.

There is no such silent drop. All traffic to Gmail is either delivered or rejected at SMTP time.

This is demonstrably not true. Just send mail to an email list that you are on. The email will be sent (confirm with other list members), however you will not receive it when it is relayed to the group by the listserver.

(Or was your comment tongue-in-cheek?)

That's actually an incredibly annoying fallout of gmail's deduplication that cannot be disabled. I believe gmail de-duplicates your list echo because it sees a copy in your sent folder. I wish it could be disabled :-/

Yes, this is a very annoying "feature" of gmail.

If list owners wanted this to be a feature, you could configure it on a list basis, at least in mailman. However nobody does, because it's incredibly annoying :-)

Agreed. Whenever I mail a list if I have an important message I have to ask someone if the message appeared or not. I can't verify by receiving my own copy. I use mail lists every day.

Your complaint seems to lie with the list management software, not with gmail.

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