On Tuesday 05 February 2013 13:12:29 [email protected] wrote:
> Hi,
> I'm using RC .0.8.4, MTA is Postfix (on Centos 6).
> There is a way to limit number of messages that a particular user can send
> at one time?
> For example: not more than 10 recipient for single message 

// Maximum number of recipients per message. Default: 0 (no limit)              
                                                                                
                                                     
$rcmail_config['max_recipients'] = 0;

> or not more that 50 message/hour?

// How many seconds must pass between emails sent by a user                     
                                                                                
                                                     
$rcmail_config['sendmail_delay'] = 20;

On postfix side:

# # The maximal number of recipients that the Postfix SMTP server accepts per 
message delivery request.
smtpd_recipient_limit = 100

# The maximum number of message delivery requests that an SMTP client may make 
in the time interval specified with anvil_rate_time_unit (default: 60s).        
                                                      
smtpd_client_message_rate_limit = 10

-- 
Arthur Titeica
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