No it's fine, this is a topic of general interest. Missing mail typically means a false positive from spam filtering. We previously used Postini, and when they shut down switched to Spam Hero. There's definitely room for improvement and I'm always open to suggestions if anyone knows of something better.
In addition we have a max message size, which is currently set to 150KB. The reason for this is we had serious abuse issues with large messages back in the day, and also we don't really want to cater towards attachment heavy mailing lists. A mailing list full of PowerPoint slides or similar consumes thousands of times the resource of textual lists. I am sorry if you were the collateral damage victim of either of these mechanisms and we're happy to do a re-import missed messages.
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