> On Thu, Jun 17, 2010 at 06:55:33PM +0200, Carlos Velasco wrote: > >>> Loop detection is on by default when the destination port is 25. >>> Loop detection matches on either banner hostnames or interfaces >>> or IP addresses found in inet_interfaces or proxy_addresses. >> >> It could be good to have a switch to turn it off for cases like this :) >> >>> Alternatively, you can override "inet_interfaces" for just the >>> smtp(8) delivery agent: >>> >>> smtp unix ... smtp >>> -o inet_interfaces=127.0.0.1 >> >> I think I will go with this as this one doesn't need smtpd to listen on >> 127.0.0.1:25. > > I think this is a mistake, in the sense that it is a crude work-around. > The right solution is keep the "inet_interfaces" settings of Postfix > instances *disjoint*, and to never forward mail to port 25 *within* > an instance. This keeps things clear and predictable. > > - Each instance "owns" a separate pool of IPs > > - Internal forwarding is never to port 25, that's > where outside mail comes in, and you never loop > it back-in again. > > - Loop detection is not disabled. > > Don't fight the system, work within the design. >
Sorry, but I don't see your point here. I understand the check as to stop a mail bouncing to itself, but this is not the case, mail is going from one instance to another. This is, postfix is assuming that it is always listening on port 25 where this is not the case, this instance is listening on another port (via master.cf) and the other instance is the one listening on port 25. So the mail is not bouncing to itself really. I looked into code and can see that the check only applies to port 25, so I suppose it is rather an assumption that postfix is always listening on that port. But really it is not the case here. As per a pool of ip addresses by instance, well, yes, it makes things cleaner, although a bit more difficult into networking, but when we are working with public Internet IP addresses it makes not happy to any NCC to "waste" scarce public IP addresses for this :) Regards, Carlos Velasco *************** AVISO LEGAL *************** Este mensaje va dirigido, de manera exclusiva, a su destinatario y contiene información confidencial y sujeta al secreto profesional, cuya divulgación no está permitida por la ley. En caso de haber recibido este mensaje por error, le rogamos que, de forma inmediata, nos lo comunique mediante correo electrónico remitido a nuestra atención o a través del teléfono (+34 914531200) y proceda a su eliminación, así como a la de cualquier documento adjunto al mismo. Asimismo, le comunicamos que la distribución, copia o utilización de este mensaje, o de cualquier documento adjunto al mismo, cualquiera que fuera su finalidad, están prohibidas por la ley. Le informamos, como destinatario de este mensaje, que el correo electrónico y las comunicaciones por medio de Internet no permiten asegurar ni garantizar la confidencialidad de los mensajes transmitidos, así como tampoco su integridad o su correcta recepción, por lo que el CNIC no asume responsabilidad alguna por tales circunstancias. Si no consintiese la utilización del correo electrónico o de las comunicaciones vía Internet le rogamos nos lo comunique y ponga en nuestro conocimiento de manera inmediata. *************** LEGAL NOTICE ************** This message is intended exclusively for the person to whom it is addressed and contains privileged and confidential information protected from disclosure by law. If you are not the addressee indicated in this message, you should immediately delete it and any attachments and notify the sender by reply e-mail or by phone (+34 914531200). In such case, you are hereby notified that any dissemination, distribution, copying or use of this message or any attachments, for any purpose, is strictly prohibited by law. We hereby inform you, as addressee of this message, that e-mail and Internet do not guarantee the confidentiality, nor the completeness or proper reception of the messages sent and, thus, CNIC does not assume any liability for those circumstances. Should you not agree to the use of e-mail or to communications via Internet, you are kindly requested to notify us immediately.
