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X-PopBeforeSMTPSenders
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Include a list of Pop before SMTP senders in the X-PopBeforeSMTP header when relaying mail. Includes a list of authorized senders in the X-PopBeforeSMTP header when relaying mail. (Senders who have passed pop-before-SMTP authentication).
Example:
X-PopBeforeSMTPSenders: matt@something.net.au
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