On 3/13/2015 5:18 AM, jayesh shinde wrote: > Hi , > > I am facing problem of bandwidth choke issue between remote location > and SMPT server. > Please giude for below. Want to know how the other busy servers are > handling such issues. > > scenario :-- > ------------- > 1) I have centralize high traffic SMTP server with > postfix-2.10.0-1.el6.x86_64 and different locations offices. > 2) Branch users send the emails from different email clients like MS > outlook or Thunderbird etc ... > 3) Currently we have set global 5 MB message size restriction in > postfix's main.cf . > If any one send email more than above 5 MB that get reject and > end user get notification pop-up in email client. > > Problem :-- > -------------- > 1) Some time few end users are sending more than 5 MB emails , which > getting travel from Location office to Server and utilizing higher > bandwidth. > 2) Server reject the emails when complete email get transfer i.e > from email client to server. But not before the actual mail transfer. > 3) When many different location users send such higher size email > traffic , the internet bandwidth is either getting chock or > utilizing very high. > 4) Some time such higher size emails get stuck in outbox of email > clients , and after certain auto set "send/receive" interval the > email client sending that email again to server. > > Expecting solution :-- > --------------------------- > 1) If any one send email more than 5 MB , then server must detect > the mail size before the actual mail transfer from desktop or > server . > And base on that server must either accept or reject the > email with define rule set. The rule set could be either for > email id or domain or IP. > > 2) I came to know that every email client don't send the "email > size" information in first mode of SMTP transaction ( I am not > sure about this. ) > But if this is the case , then which are the standard email > client which send the "email size" information in first SMTP > transaction mode ? > So that with some customized milter or 3rd party script the size > base restriction policy can apply and issue can control > > Is there any method / parameter in postfix config by which I can > control this situation ? > > Regards > Jayesh Shinde >
You'll need to use the traffic shaping features of your firewall. Postfix does not do this by itself. -- Noel Jones
