Am 25.03.2010 14:26, schrieb David Michard: > Hello, > > I know this question has been discussed on this list* but no suitable > solution was provided for our SMTP server settings. > A patch** is published but reports on this list say that it does not work. > > I am responsible for a medium sized mailing-list, through which one > email is sent per day to roughly 600 000 subscribers. Since our > mailing list is growing, we are having more and more problems with > very conservative SMTP servers enforcing a low number of simultaneous > connections from a single IP address. Our subscribers wish to receive > their email as soon as possible so delaying the email for a few hours > is not an option. > I was thinking of allocating 4 IP aliases for our SMTP server so that > connections would appear to come from different servers. The goal is > not to flood*** the target server as our own postfix server has its > own limit to the number of simultaneous active connections, set to 30 > connections. > > The application uses the "sendmail" binary to send email, and not SMTP. > One email is sent per subscriber and signed with dkimproxy plugged > onto the "pickup" daemon. > Each email is always sent from the same nore...@mydomain.org address. > > Is it possible to tell postfix to randomly select an IP address, and > associated hostname (as many smtp servers perform RDNS lookups and > compare it to the HELO/EHLO greeting) when sending an email ? > That would be very helpful. > > Regards, > David. > > (*) http://www.mail-archive.com/postfix-users@postfix.org/msg18400.html > & http://www.mailinglistarchive.com/postfix-users@postfix.org/msg57399.html > (**) http://denixsolutions.com/Scripts/Postfix-Multiple-Interfaces-Patch > (***) At this stage I feel it is necessary to stress that the > mailing-list is not for profit and that we take every step to make > sure that subscribers who change their mind are unsubscribed as soon > as possible. We use confirmed opt-in (aka "double opt-in") for > subscription, simplified unsubscription, every RFC compliant headers > required for bulk emailing, VERP, SPF, DKIM, complaint feedback loop > with ARF with most providers etc in order to maintain a high > deliverability ratio. I am not willing to give the name of the > organisation so you will have to take my word for it.
i would prepare fallback_relays and special transports by recipient domains -- Best Regards MfG Robert Schetterer Germany/Munich/Bavaria
