When a mail is sent to one of the argouml mailing lists and it is not automatically approved, it is sent to the moderator for approval.
The moderator approves or rejects it by sending a mail to one of the mail addresses in the mail he receives.
If the moderator rejects the mail, a message can be sent to the original poster.
Here is a suggestion of such a message that Linus Tolke uses on the argouml dev list:
%%% Start comment Hello! You have written a mail to an ArgoUML mailing list. Your mail was not automatically approved by the mailing list mechanism but instead sent to me, the moderator, for approval. Most likely, this is because you are not subscribed to the list or the from field of the sent mail was different from the mail address that is subscribed to the list so the list mechanism don't consider you as subscribed. As a moderator, I assume that this was a misstake. Either a misstake to send the mail to the list in the first place since the list don't accept mails from non-subscribers, or a misstake in using the incorrect from address. For this reason I have not approved you mail for the mailing list. If the misstake was that you had forgot to subscribe, please subscribe and resend the mail. If the misstake was that you used the incorrect from address, please resend the mail using the correct from address. If this is not a misstake, I assume that this is because you are subscribed to the mailing list with one mail address and wants to (or has to) send mails using another. This is possible, however some special allowing is possible. If this is the case, please send me a mail at email@example.com explaining this and including your two mail addresses, and then send the mail immediately again. Then I will approve the mail and allow your mail address so that future postings will go through immediately. There are two reasons for not allowing posts to the list without being a member. The first one is from a spam fighting perspecting. The ArgoUML mailing lists attract a fair amount of commercial messages and scams that we don't want to resend to all list members. The second one is that answers to your postings on the list are always sent back to the list. Unless you are a member you will miss it. For this reason, if you become a member on the list just to send a single mail, please linger on the list for a couple of weeks to receive any answers or follow-ups to your mail. I hope that you accept the policy and the measure taken by me, the moderator and wish you welcome to the ArgoUML project and the mailing list. /Linus, moderator of the mailing list %%% End comment