Doing a bit more research on Microsoft's sites, it appears that 256 characters is the subject line length limit on all Microsoft email related products (Outlook, MS Exchange, Office 365, etc.). Since I would guess that the a good portion of the Alert Central users will have email alerts go through some piece of Microsoft email technology of some sort, truncating the email subject line to less than this to allow space for the ACNID block would be very helpful.
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