We have been having issues with bounces and people getting removed from the list subscriptions as of late. It seems to mostly affect Gmail users, but some others have been getting kicked as well. Gmail is getting particularly picky about valid mail headers.
I'm looking into ways of preventing this from happening. I've done the following to prevent further issues:
* Raise the bounce threshold in mailman to 10.0 * Add SPF record to DNS * Add DMARC policy to DNS * Add DKIM key signing to all outbound mail, and matching key in DNS
We also have been hitting our bandwidth threshold at our co-lo. When this happens they start to drop packets on us as a form of throttling. This always happens when I do a full CDN flush. As this really chews up the bits when the mirrors re-sync.
To prevent that, we now have a background process watching for changed files on our master, and only changes will be flushed.
If you notice any further issues, or have suggestions, let me know.
Thanks.
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Jeremy Newman