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| Path | csiph.com!eternal-september.org!feeder3.eternal-september.org!news.eternal-september.org!.POSTED!not-for-mail |
|---|---|
| From | Salvador Mirzo <smirzo@example.com> |
| Newsgroups | comp.mail.misc |
| Subject | Re: mail @example.com without dns a-record for example.com |
| Date | Mon, 23 Dec 2024 10:23:06 -0300 |
| Organization | A noiseless patient Spider |
| Lines | 37 |
| Message-ID | <87wmfqy1mt.fsf@example.com> (permalink) |
| References | <878qs7wvmy.fsf@example.com> <vk9kht$nske$1@dont-email.me> <vkanlk$ths$1@tncsrv09.home.tnetconsulting.net> |
| MIME-Version | 1.0 |
| Content-Type | text/plain |
| Injection-Date | Mon, 23 Dec 2024 14:23:08 +0100 (CET) |
| Injection-Info | dont-email.me; posting-host="d2b4fef8c65ef16b29d587cb7006c018"; logging-data="1292383"; mail-complaints-to="abuse@eternal-september.org"; posting-account="U2FsdGVkX19uKvtxz0wQD653XSDXeG+7PXEmuzm2sH8=" |
| Cancel-Lock | sha1:DjDASylpzkqUI0k+cHR1EtiRc04= sha1:k5GYECsGO/64YJ6odTOGKHYZEQI= |
| Xref | csiph.com comp.mail.misc:1210 |
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Grant Taylor <gtaylor@tnetconsulting.net> writes: > On 12/22/24 12:07, Kalevi Kolttonen wrote: >> The email standards do not require a-record ... > > Not for the domain name with the MX record. > > But there needs to be an A and / or AAAA record for the FQDN that the > MX record references. Here's a passage from RFC 5321 that confirms this: --8<-------------------------------------------------------->8--- 5.1. Locating the Target Host Once an SMTP client lexically identifies a domain to which mail will be delivered for processing (as described in Sections 2.3.5 and 3.6), a DNS lookup MUST be performed to resolve the domain name (RFC 1035 [2]). The names are expected to be fully-qualified domain names (FQDNs) [...] [...] When a domain name associated with an MX RR is looked up and the associated data field obtained, the data field of that response MUST contain a domain name. That domain name, when queried, MUST return at least one address record (e.g., A or AAAA RR) that gives the IP address of the SMTP server to which the message should be directed. --8<-------------------------------------------------------->8--- >> ... so this must one of Gmail's quirks. > > I wonder if this might be a Google'ism wherein they saw / cached an A > record and are now cross that there isn't one. <something> > <something> security <something> false test result. Thanks for bringing that up. It turns out it just confusion on my part.
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mail @example.com without dns a-record for example.com Salvador Mirzo <smirzo@example.com> - 2024-12-22 13:05 -0300
Re: mail @example.com without dns a-record for example.com Grant Taylor <gtaylor@tnetconsulting.net> - 2024-12-22 10:36 -0600
Re: mail @example.com without dns a-record for example.com Claus Aßmann <INVALID_NO_CC_REMOVE_IF_YOU_DO_NOT_POST_ml+sendmail(-no-copies-please)@esmtp.org> - 2024-12-22 12:22 -0500
Re: mail @example.com without dns a-record for example.com Salvador Mirzo <smirzo@example.com> - 2024-12-23 10:18 -0300
Re: mail @example.com without dns a-record for example.com kalevi@kolttonen.fi (Kalevi Kolttonen) - 2024-12-22 18:07 +0000
Re: mail @example.com without dns a-record for example.com Grant Taylor <gtaylor@tnetconsulting.net> - 2024-12-22 22:07 -0600
Re: mail @example.com without dns a-record for example.com Salvador Mirzo <smirzo@example.com> - 2024-12-23 10:23 -0300
Re: mail @example.com without dns a-record for example.com John Levine <johnl@taugh.com> - 2024-12-22 21:00 +0000
Re: mail @example.com without dns a-record for example.com Salvador Mirzo <smirzo@example.com> - 2024-12-23 10:08 -0300
Re: mail @example.com without dns a-record for example.com Salvador Mirzo <smirzo@example.com> - 2024-12-23 22:01 -0300
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