Re: [Exim] 451-Invalid HELO

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Autor: Tom Playford
Data:  
Dla: exim-users
CC: Richard Welty
Temat: Re: [Exim] 451-Invalid HELO
A quick DNS and /etc/hosts file adjustment I think I've fixed it.

Thanks for your help, turns out it was a stupid problem.

Tom


Richard Welty wrote:
> On Wed, 28 Apr 2004 22:46:54 +0100 Jeremy Harris <jgh@???> wrote:
>
>>Tom Playford wrote:
>>
>>>2004-04-28 21:53:09 1BIQbt-0000qF-00 ==
>>>help@??? T=remote_smtp defer
>>>(0): SMTP error from remote mailer after RCPT
>>>TO:<help@???>: host
>>>oxmail.ox.ac.uk [163.1.2.161]: 451-Invalid HELO (**my-server-name**)
>>>used by **my-server-ip**. See
>>>RFC2821 S4.1.1.1 for syntax\n451-of the HELO command. This is a
>>>temporary error. You may try again
>>>after\n451 this server (**my-server-ip**) has been fixed.
>
>
>>*my-server-name* either includes an underbar, or fails to
>>includes any dots?     Your HELO name is supposed to be
>>an FQDN.

>
>
> to be pedantic, it can also be an ip address inside of square
> brackets, e.g.
>
> HELO [192.0.2.5]
>
> i generally reject bad syntax in HELO myself (except for
> those $%$@#!@$ _ characters beloved of M$ administrators).
> rejecting ip addresses not inside [] kills a lot of abusive email
> with few if any false positives, at least that i can see. likewise,
> better than 99% of hosts doing something like
>
> HELO FXEKDF
>
> are hosts you don't really want to accept email from; very
> few false positives there.
>
> richard
> --
> Richard Welty                                         rwelty@???
> Averill Park Networking                                         518-573-7592
>     Java, PHP, PostgreSQL, Unix, Linux, IP Network Engineering, Security

>
>
> --
>
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