I have a list that contains roughly 4500 items in it. The default view is set to return 25 items at a time. The list is a discussion board set up to receive email updates, receiving approximately 30 per day.
I have an issue where every week or so the email stops working. Anyone who emails the list gets an Undeliverable message. Disabling the email address and reenabling it "reactivates" the list email address in our mail server.
This is the only list that has this problem, other lists continue to receive email just fine during this time.
This problem used to occur once a month or so, now it is much more frequently, along the lines of once a week.
Edit:
I have read the whitepaper "Working with large lists in Office SharePoint Server 2007" but it doesn't address email issues at all.
Also, I wanted to confirm that the contact in Active Directory used for the email feature is actually removed from the AD Container until we reenable the email feature.
There's a great resource to enabling email on a list (it's a pdf), and it has a good section on troubleshooting, but it doesn't address this issue.