sebbASF commented on issue #429: Do less aggressive subject nesting URL: https://github.com/apache/incubator-ponymail/pull/429#issuecomment-355861618 There will only be 100 unconnected threads if the mailers are broken and don't provide Reference headers. Are there many such broken clients? Anyway I think it's better to have broken threads than to merge unrelated threads. In the latter case it's easy to lose sight of the misfiled mail (indeed that's what alerted me to the problem; I could not see the mail I had just sent).
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