A quick couple of questions regarding "From", "Sender" and Gmail

I'm trying to reply to a comment from a Mailman list subscriber on a list I manage, and have a couple of questions which someone might be able to answer quickly, or post me a link, much faster than I can research the matter.
At what header fields an an email (From, Sender, Reply-to) does Mailman 2.1.15 look when determining if an email is from a list subscriber and what's the algorithm it uses, if other than a simple OR of the addresses?
What are the known issues with Gmail and Mailman, especially those which might result in an email being silently dropped on the floor? A reference to an existing thread or article would be helpful.
-- Lindsay Haisley | "We are all broken toasters, but we still FMP Computer Services | manage to make toast" 512-259-1190 | http://www.fmp.com | - Cheryl Dehut

Never mind, I found everything I needed.
On Mon, 2012-12-10 at 15:41 -0600, Lindsay Haisley wrote:
-- Lindsay Haisley | "Real programmers use butterflies" FMP Computer Services | 512-259-1190 | - xkcd http://www.fmp.com |

Never mind, I found everything I needed.
On Mon, 2012-12-10 at 15:41 -0600, Lindsay Haisley wrote:
-- Lindsay Haisley | "Real programmers use butterflies" FMP Computer Services | 512-259-1190 | - xkcd http://www.fmp.com |
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Lindsay Haisley