On 04/01/2009 20:11, "mouss" <mo...@ml.netoyen.net> wrote:
> Nigel Gilbert a écrit :
>>
>>
>> On 04/01/2009 19:33, "Sahil Tandon" <sa...@tandon.net> wrote:
>>
>>> Nigel Gilbert wrote:
>>>
>>>> I have Postfix running on dusty.soc.surrey.ac.uk. I would like mail from
>>>> the internet addressed to unknown local users on this server (e.g. to
>>>> x...@soc.surrey.ac.uk) to be re-addressed and forwarded
>>> Before continuing, please clarify: are the unknown local users known
>>> relay recipients? Or are you trying to devise some sort of 'catch-all'
>>> that forwards *all* mail to unknown users (local or otherwise) to this
>>> other mail server? The latter is a bad idea.
>>>
>>> [...]
>>
>> The latter, but although it may in general be a bad idea, (1) the other
>> server (surrey.ac.uk) is well set up for catching and dealing with spam etc.
>> (e.g. all mail sent to it is processed through messagelabs span filtering),
>> and (2) there is no easily accessible list of users that are known on
>> surrey.ac.uk, but unknown to soc.surrey.ac.uk.
>>
>
> the question is whether some users may be rejected by the second server.
> if so, they must also be rejected by the first one.
>
> if this is ok, then simply declare the domain as a relay domain and use
> virtual_alias_maps to deliver some users locally.
May I ask for one more level of detail about how to do this? I am new to
postfix.
" simply declare the domain as a relay domain"
I add
relay_domains = surrey.ac.uk
to main.cf. Correct?
"use virtual_alias_maps to deliver some users locally"
I add
virtual_alias_maps = hash:/etc/postfix/virtual
to main.cf
In the file hash:/etc/postfix/virtual I put:
known.local.us...@soc.surrey.ac.uk known.local.user
Etc.
And then run postmap /etc/postfix/virtual
Is that right?
When the mail for an unknown user is relayed to surrey.ac.uk, will it appear
to be addressed to unknown.u...@surrey.ac.uk (although originally sent to
unknown.u...@soc.surrey.ac.uk)? It needs to be, because otherwise
surrey.ac.uk will just send it back to soc.surrey.ac.uk!
Thank you for your help and advice,
Nigel
________________________________________________________________
Professor Nigel Gilbert, ScD, FREng, AcSS, Professor of Sociology,
University of Surrey, Guildford GU2 7XH, UK. +44 (0)1483 689173
