There is no requirement in any standard for HELO name to have A record.
It may e.g. have SPF TXT record.
RFC 5321 says
The domain name given in the EHLO command MUST be either a primary
host name (a domain name that resolves to an address RR) or, if
the host has no name, an address literal, as described in
Section 4.1.3 <https://tools.ietf.org/html/rfc5321#section-4.1.3> and
discussed further in the EHLO discussion of
Section 4.1.4 <https://tools.ietf.org/html/rfc5321#section-4.1.4>.
and
An SMTP server MAY verify that the domain name argument in the EHLO
command actually corresponds to the IP address of the client.
However, if the verification fails, the server MUST NOT refuse to
accept a message on that basis. Information captured in the
verification attempt is for logging and tracing purposes. Note that
this prohibition applies to the matching of the parameter to its IP
address only; see Section 7.9
<https://tools.ietf.org/html/rfc5321#section-7.9> for a more extensive
discussion of
rejecting incoming connections or mail messages.
So the problem is actually on your side.
09.05.2018 14:03, [email protected] пишет:
> Am 08.05.2018 um 23:22 schrieb Scott Undercofler:
>> Out of some morbid curiosity, can you elaborate or post a session or log?
> Here we go:
>
> May 6 18:39:03 frodo postfix/smtpd[7158]: NOQUEUE: reject: RCPT from
> dcrmsace03.verizon.com[192.76.84.75]: 450 4.7.1
> <dcsactrans2.verizon.com>: Helo command rejected: Host not found;
> from=<[email protected]> to=<xxx@yyyy> proto=ESMTP
> helo=<dcsactrans2.verizon.com>
>
> dcsactrans2.verizon.com
>
> The hostname is invalid.
>
> Hearing that it's AOL, I assume the problem will remain unsolveable when
> I look at the past trouble with AOL.
>
> Regards,
>
> Andreas
>
>>> On May 8, 2018, at 9:00 PM, [email protected] wrote:
>>>
>>> Hi!
>>>
>>> Does anyone know how to reach the verizon.com Postmaster.
>>>
>>> Being a customer there (but the company publishes no email contact
>>> address and customer support cannot help), they try to send me mail to
>>> my own mail server but violating the smtp protocol (HELO command) so my
>>> server rejects those mails.
>>>
>>> I would like to make them aware of that.
>>>
>>> Regards,
>>>
>>> Andreas
>>>
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--
Vladimir Dubrovin
@Mail.Ru
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