Larry,
The only ones I have ever seen are from the General Records Schedules from 
the National Archives (Schedule 23-7 and 23-10).

GRS 23-7:
7. Transitory Files.

Records of short-term (180 days or less) interest, including in electronic form 
(e.g., email messages), which have minimal or no documentary or evidential 
value.
Destroy immediately, or when no longer needed for reference, or according to 
a predetermined time period or business rule (e.g., implementing the auto-
delete feature of electronic mail systems).

GRS 23-10:
10. Electronic Mail and Word Processing System Copies. 

Electronic copies of records that are created on electronic mail and word 
processing systems and used solely to generate a recordkeeping copy of the 
records covered by the other items in this schedule. Also includes electronic 
copies of records created on electronic mail and word processing systems that 
are maintained for updating, revision, or dissemination. 

• Copies that have no further administrative value after the recordkeeping 
copy is made. Includes copies maintained by individuals in personal files, 
personal electronic mail directories, or other personal directories on hard disk 
or network drives, and copies on shared network drives that are used only to 
produce the recordkeeping copy. 

Destroy/delete within 180 days after the recordkeeping copy has been 
produced. 

• Copies used for dissemination, revision, or updating that are maintained in 
addition to the recordkeeping copy. 

Destroy/delete when dissemination, revision, or updating is completed.

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