Re: [exim4] Testing and making sense of smtp output
On 10/13/2014 5:25 AM, Brian wrote:
> On Mon 13 Oct 2014 at 04:06:27 +0200, lee wrote:
>
>> Harry Putnam <reader@newsguy.com> writes:
>>
>>> lee <lee@yagibdah.de> writes:
>>>
>>> [...]
>>>
>>> Thanks for the tips.
>>>
>>>>> SMTP>> EHLO 2xd
>>>
>>>> That's an invalid helo string.
>>>
>>> Is a valid one made up of just the full fqdn?
>>
>> See https://tools.ietf.org/html/rfc2821#section-4.1.1.1
>>
>> It says to either use the fqdn or, if not possible, an IP
>> literal. However, it's common practise to deny IP addresses in HELO
>> greatings.
>
> An address literal is not the same as an IP address. An MTA should not
> be rejecting mail on the basis that the HELO is an address literal.
>
> It's probably academic what the HELO is most of the time. Many ISPs
> will accept any old rubbish for it.
>
>
And more and more companies are rejecting invalid or incorrect
information in the HELO message.
Jerry
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