Tickets :: Comment on [#15152] Mail cannot be forwarded via Activesync

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Comment	> I've narrowed this down to the "Thread-Index" header that outlook is > sending in the ActiveSync forward command. It is too long to be sent > without the SMTP Binary extension, which not many smtp servers > actually support out of the box (including Postfix). > > Looking into how we can intercept this and possibly mitigate.
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