# RFC 1846: SMTP 521 Reply Code

> request for comments publication

**Wikidata**: [Q47455494](https://www.wikidata.org/wiki/Q47455494)  
**Source**: https://4ort.xyz/entity/rfc-1846-smtp-521-reply-code


## References

1. RFC Index
2. DBLP Dataset 2021-01-02