From: Alejandro Facultad (alejandro_facultadyahoo.com.ar)
Date: Thu Feb 07 2008 - 09:19:09 CST

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Noel Jones wrote:
> Alejandro Facultad wrote:
>> Dear all, I have Postfix 2.3.8 as my mail server and I want this: if
>> someone write a message to a non existant mail account from my domain,
>> he/she must get a response code = 250 and not 550. I want the same
>> response code that he/she will obtain in case of writting to an
>> existing mail account.
>>
>> I edit the main.cf adding "reject_unverified_recipient" and
>> "unverified_recipient_reject_code = 250" in this way but people
>> writting to a non valid mail account still get the 550 error code:
>>
>> smtpd_recipient_restrictions =
>> check_recipient_access hash:/etc/postfix/access
>> permit_mynetworks
>> reject_unknown_sender_domain
>> reject_unauth_destination
>> check_policy_service unix:private/policy
>> reject_unverified_recipient
>>
>>
>> unverified_recipient_reject_code = 250
>>
>> Thanks in advance
>>
>> Alejandro
>
> What exactly is the point of this? This sounds like a really bad idea.
>
> Don't use reject_unverified_recipient if you don't want to reject unverified recipients.
>

Noel, I want people from Internet that send messages to non existant
users from my domain they don't get an error code (550) but they must
get an 250 success code. They don't have to know which mail accounts
are valid or invalid, they must see ALL accounts as valid, because
nowadays there are a lot of intruders getting our mail accounts,
probing time after time via telnet port 25 and if they get code 250
they get a valid account. We want the intruders always get code 250 so
they can't discriminate between valid and invalid mail accounts.

I work for a company with strong security policies for mail accounts.

Thanks a lot.

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