On 2015-07-21 14:02 -0400, Peter P. wrote: > Am I then right to assume that References: header fileds are derived > from Message-IDs, and that by setting $hostname should hence be the > solution to my problem?
It will solve your problem (such as it is) for new threads from now on. In existing threads, existing message-ids embedded in References will stay as they are (even in new messages in those threads). Message-Ids are immutable, that is part of their value. -- Please *no* private copies of mailing list or newsgroup messages. Rule 420: All persons more than eight miles high to leave the court.