Cited by: RFC 7504
1 RFCs whose text mentions RFC 7504 (SMTP 521 and 556 Reply Codes), newest first
| RFC | Title | Status | Date |
|---|---|---|---|
| 7505 | A "Null MX" No Service Resource Record for Domains That Accept No Mail | Proposed Standard | June 2015 |
1 RFCs whose text mentions RFC 7504 (SMTP 521 and 556 Reply Codes), newest first
| RFC | Title | Status | Date |
|---|---|---|---|
| 7505 | A "Null MX" No Service Resource Record for Domains That Accept No Mail | Proposed Standard | June 2015 |