
The general steps of correspondence processing are:
Correspondence requests are created via business transactions or correspondence runs.
Correspondence data is stored in the correspondence container.
Correspondence data is selected and the print via a correspondence run is prepared.
Correspondence data is printed using the print workbench.

The correspondence history stores information about all correspondence, including inbound correspondence.
The correspondence history features are, for example, the archiving of correspondence and the pixel viewer for letters. The pixel viewer is a viewing tool similar to Adobe Acrobat Reader, used to read optically archived documents.
The shipping control enables you to define the underlying options for shipping (printer, e-mail, fax, number of copies). Shipping control is primarily used by the correspondence variants.
The correspondence variant summarizes correspondence types to control the periodic correspondence.
The correspondence variant can be assigned to contract accounts.
SAP Easy Access Menu: Transaction CAA3.
Enter Contract Account T-CA071000.
Choose Enter.
Choose tab Dunning/Correspondence.

If an entry exists in the Correspondence Recipient field, this business partner will replace the original recipient in all cases, except if any specific correspondence types are defined to go elsewhere (for example, recipients for individual correspondence types).
The Alternate or Additional Correspondence Recipient indicator specifies whether a recipient is a substitute for the original recipient.
If this flag is not selected, any partners listed will receive a copy of the correspondence.
If the flag is selected, only the alternative correspondence recipient receives a copy. The correspondence is not sent to the actual business partner.

All periodic correspondence must be defined in the correspondence variant.
The correspondence charge schedules are charges that can be set per correspondence type. For example, if you wanted to charge your customer a small fee for reinvoicing, you would configure a charge schedule and enter it in the correspondence variant.
The dispatch Control is used to send a document (invoice, dunning notice) in different forms and in multiple copies (e-mail, fax). You can define the shipping control in customizing of the print workbench.
The control parameters defined in a correspondence variant are evaluated when the correspondence is created.