I'm the moderator of a group. How do I update the email address of one of my group members to his new email?

Quite likely a Yahoo bug, if your group has more than 400 members -- see the other Questions here relating to having Customer Care re-sync one's group. Have a look in the group's Management page, at the Memberships activity log. Search that log for the email address and you'll likely find when they joined (and possibly left) the group.

The database sync issue can result in inconsistent behavior, such as treating them as Members for some purposes yet not showing them in the Members list. Sometimes if you ban the address that will shake loose whatever is stuck in the database. You can do that from the Ban link above and to the right on the Members page.

Or, someone from Yahoo staff may see this question and re-sync the group for you.

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