Re: IPv6 recap
Alessandro Vesely <[email protected]>
| Newsgroups | gmane.mail.imap.courier.general |
|---|---|
| Message-ID | <[email protected]> |
On Wed 27/Mar/2024 04:56:18 +0100 Lindsay Haisley wrote:
> On Tue, 2024-03-26 at 19:47 -0300, Mario Roberto Ferreira wrote:
>> But, isn't it just assigning IPV4 and IPV6 to the MX?
>> Example
>> domain.com MX mail.domain.com
>> mail.domain.com A ipv4
>> mail.domain.com AAAA ipv6
>>
>> It's not correct?
No, it's rater like:
domain.com MX 1 mail.domain.com
MX 6 mail6.domain.com
mail.domain.com A ipv4
mail6.domain.com AAAA ipv6
> The MX is always a fully qualified host name, not an IP address. It
> will resolve in DNS space to whatever kind of address is spec’d there
> as a resolution of the FQHN.
The FQHN must be resolvable. In the words of RFC 5321, Sect. 5.1:
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.
Best
Ale
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