# Recommendation X.411 (11/1988): Message handling systems: Message transfer system: abstract service definition and procedures

> superseded recommendation/international standard from the International Telecommunication Union

**Wikidata**: [Q26985504](https://www.wikidata.org/wiki/Q26985504)  
**Source**: https://4ort.xyz/entity/recommendation-x-411-11-1988-message-handling-systems-message-transfer-system-abstract-service-definition-and-procedures