Rewrite Message-Id Header
This option informs Lyris List Manager to leave the Message-id header alone and instead use X-Lyris-Message-Id for that purpose.
The Message-Id syntax is rewritten by Lyris List Manager to put the recipient email address in it, for easier human reading of bounces.
Some users object to Lyris List Manager rewriting the Message-Id to be unique for each member, so this option allows you to disable this feature.
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