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IETF RFC 7505
[ACTIVE]

A "Null MX" No Service Resource Record for Domains That Accept No Mail

Metadata

Publisher
IETF
Doc Type
Standard
Pages
6
Abstract
Internet mail determines the address of a receiving server through the DNS, first by looking for an MX record and then by looking for an A/AAAA record as a fallback. Unfortunately, this means that the A/AAAA record is taken to be mail server address even when that address does not accept mail. The No Service MX RR, informally called "null MX", formalizes the existing mechanism by which a domain announces that it accepts no mail, without having to provide a mail server; this permits significant operational efficiencies.
Publication Date
2015-06-01
Status Note
Proposed Standard
DOI
10.17487/RFC7505
Link
https://doi.org/10.17487/RFC7505
Author(s)
John R. Levine
Mark Delany
Keyword(s)
DNS, Email
Latest version of IETF RFC 7505

Document Versions — IETF RFC 7505

  • ▶ IETF RFC 7505 (2015-06-01)
    THIS DOC [ACTIVE] [LATEST VERSION]

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IETF RFC 7505, A "Null MX" No Service Resource Record for Domains That Accept No Mail. Available at https://doi.org/10.17487/RFC7505
Snippet:
IETF RFC 7505, A "Null MX" No Service Resource Record for Domains That Accept No Mail. Available at https://doi.org/10.17487/RFC7505

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IETF RFC 7505, A "Null MX" No Service Resource Record for Domains That Accept No Mail. Available at https://doi.org/10.17487/RFC7505
Snippet:
<span class="citation"><cite>IETF RFC 7505</cite>, A &quot;Null MX&quot; No Service Resource Record for Domains That Accept No Mail. Available at <a href="https://doi.org/10.17487/RFC7505" target="_blank" rel="noopener">https://doi.org/10.17487/RFC7505</a></span>

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Preview:
IETF RFC 7505, A "Null MX" No Service Resource Record for Domains That Accept No Mail
doi: 10.17487/RFC7505
url: https://doi.org/10.17487/RFC7505
Snippet:
<li>
<cite id="bib-rfc7505">IETF RFC 7505</cite>, A &quot;Null MX&quot; No Service Resource Record for Domains That Accept No Mail
<span class="doi">10.17487/RFC7505</span>
</li>

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