From: mouss (mlist.onlyfree.fr)
Date: Wed May 30 2007 - 06:05:40 CDT

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mouss wrote:
> Duane Hill wrote:
>> On Tue, 29 May 2007, mouss wrote:
>>
>>> Duane Hill wrote:
>>>> On Tue, 29 May 2007, mouss wrote:
>>>>
>>>>> - if it contains junk characters, then it is invalid both in terms
>>>>> of the RFC and in terms of common use.
>>>>> - you can also reject negative numbers: /^-\d+$/. These are
>>>>> invalid and were never reported in legitimate mail. seems like
>>>>> abroken ratware.
>>>>> - you can also reject numeric helos: /^\d+$/. They are invalid,
>>>>> and there doesn't seem to be a lot of legitimate broken sites
>>>>> using these.
>>>>
>>>> Doesn't reject_invalid_helo_hostname take care of these invalid
>>>> helo's? In testing, I can't helo as a negative or positive number
>>>> with the option. I'm not sure as I can't find the detail of what an
>>>> invalid_helo_hostname entails.
>>>
>>> you may have a reject_non_fqdn_hostname in your config. rejecting
>>> "123" because it is non fqdn or because it is a numeric helo are
>>> different decisions. some people cannot reject non fqnd helo's, but
>>> they can still reject numeric ones.
>>
>> I understand that. However, I mentioned reject_invalid_helo_hostname.
>>
>>
>
>
> reject_invalid_hostname will reject a helo if it not a valid hostname
> and not a valid literal IP (IPv4 or IPv6). for "safety|compatibility",
> postfix will accept a naked IP.
>
> Here, a valid hostname is formed with alphanumeric, dots and hyphens.
> the hostname and all its labels (the strings separated by dots) must
> start with an alphanumeric. no empty label is allowed (i.e. adjacent
> dots are not allowed). It must not be all numeric ('1234'). the
> hostname is limited to 255 chars and its labels are limited to 63 chars.
>
> See RFC 1035 for more infos.
>

I forgot to mention that postfix will accept underscores instead of
dashes, for compatibility reasons.

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