On Tue Jul 21 14:02:40 2015, 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? I will try to find out.
Yes, you’re right. The References: field is used to sort the emails in a theard. The field In-Reply-To is also used. It’s explained in the RFC4021 https://tools.ietf.org/html/rfc4021#section-2.1.10 -- alarig
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