My LoginECRWSS stands for Extended Carrier Route Walk Sequence Saturation, a USPS endorsement that appears on saturation mail in place of individual addresses.
This is general USPS terminology rather than something the Printing for Less pages spell out. It is usually placed in the address area with a line such as Postal Customer.
Also called: Extended Carrier Route Walk Sequence Saturation
Related: Saturation Mailing Indicia Carrier Route
