Hi all,
one function of this list is to be open to social media suggestions from occasional contributors, who may not be on this list. Because it also receives spam, such messages normally need to be approved manually by the list moderators (James and myself). But following a discussion elsewhere, I have just whitelisted all @wikimedia.org addresses. We'll see whether this works well (there is a tiny, tiny possibility that it will increase the likelihood that a spammers successfully forges a From: address to get a message through, but the probability should be really low). We can then also look further into other whitelisting options - IIRC we've already been doing that for addresses that have once sent messages which were approved.
As a general reminder: When replying to emails from non-list members on this list, one needs to CC them explicitly, or they won't receive the response. (This is of course true regardless of whether a sender is whitelisted or whether their email was approved manually.)