How do I bounce back all mails over 50 recipients

[Glenn Steen]

On 15 March 2010 12:49, Glenn Steen <glenn.steen at gmail.com> wrote:
> On 11 March 2010 08:50, ram <ram at netcore.co.in> wrote:
>>
>> On Thu, 2010-03-11 at 09:14 +0200, Lyndon Labuschagne wrote:
>>
>> On 11 Mar 2010, at 7:39 AM, ram wrote:
>>
>>> I have a requirement that mails with  over 50 recipients should be
>>> outright rejected or bounced back
>>> I assumed this would have been pretty simple to configure in MailScanner
>>> or my MTA ( postfix)
>>>
>> its not an option I have used before but this might do it
>>
>> smtpd_recipient_limit (default: 1000)
>> The maximal number of recipients that the Postfix SMTP server accepts per
>> message delivery request.
>>
>> you would use the below in your main.cf file
>> smtpd_recipient_limit = 50
>>
>> This works , but the first 50 recipients get the message , the rest get
>> rejected
>>
>> Can I reject all message for all recipients
>>
> No, not really. The RFCs demand that any MTA who reject an RCPT TO: do
> not change state. That is, it is required to remain in the state where
> it will wait for more recipients or the DATA command.
>
> What you could try do is drastically lower some other limits, like the
> smtpd_recipient_overshoot_limit, so that the recipients after 50 count
> as errors, and then set smtpd_soft_error_limit and
> smtpd_hard_error_limit so that the conversation is discarded before a
> message is actually sent. ... But think this throuigh carefully before
> doing it, and is possible test it thoroughly... it could potentially
> have some undesired effects for your normal mail flow.
> Say that you adjust them to:
> smtod_recipient_limit = 47
smtpd_recipient_overshoot_limit = 1
> smtpd_soft_error_limit = 3
> smtpd_hard_error_limit = 4
> ... then mail up to 50 reciåpients would be OK, but *any* error past
> that (including, but not limited to, that 51:st recipient) would be
> ... delayed and .... "fatal" to the conversation;-).
>
> Cheers
,,, I really should read before hitting send...:-)

Cheers
-- 
-- Glenn
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