Re: [exim4] Testing and making sense of smtp output
Brian <ad44@cityscape.co.uk> writes:
> 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.
Oh, then what is it?
> It's probably academic what the HELO is most of the time. Many ISPs
> will accept any old rubbish for it.
That's a misconfiguration they should fix.
--
Again we must be afraid of speaking of daemons for fear that daemons
might swallow us. Finally, this fear has become reasonable.
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