[CentOS] Address Codes

One of our summer interns has stayed on during the school
year to work some weekends on special assignments. This past
weekend, her assignment was to draft, and try out, procedures
for scanning all incoming regular mail including the envelopes.
This is a new effort for us because previous mail handling was
done by another organization.

Most of our incoming mail is from other businesses that create
printed address labels.  Many of these labels also have a type
of bar code below the address.  Is there a Linux utility or
standard application that will read and translate these codes.

Thanks.