Cited in: RFC 3598
2 RFCs mentioned in the text of RFC 3598 (Sieve Email Filtering -- Subaddress Extension)
| RFC | Title | Status | Date |
|---|---|---|---|
| 2119 | Key words for use in RFCs to Indicate Requirement Levels | Best Current Practice | March 1997 |
| 2822 | Internet Message Format | Proposed Standard | April 2001 |