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Send Message-ID even if DKIM is not enabled, for compatibility with Gmail: * A workaround for Ergo 2.12.0 is to enable DKIM * You need to enable either DKIM or SPF (preferably both) to send to Gmail anyway * You also need forward-confirmed reverse DNS, which can be tricky for IPv6...
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Note: Message-ID is actually case-insensitive, so we're not getting the full entropy benefits of |
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Send Message-ID even if DKIM is not enabled, for compatibility with Gmail: