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MailStream Plus - How To Determine What does ALG CR position 10 do, the 'Optimization Indicator' option?

 For some Standard Class Letter mailings, the Basic Enhanced carrier (Line-of-Travel) rate is more expensive than some of the Automation letter rates.
In the ALG CR parameter, position 10 selecting option Q allows MailStream Plus to move basic Carrier Route mail pieces to the Automation portion of the presort, if the resulting Automation presort level rate is less expensive than Basic CRRT rate.

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UPDATED:  April 14, 2017