Alexandre Chapellon wrote: > Not public blacklists but for example Yahoo!'s servers spends most of > its days replying "defered temporarily due user complaints' o our > relays.
Start building a good reputation at Yahoo for your clean outgoing mail: - allocate a new IP address for your new 'clean' outgoing MTA, preferably outside your IP networks which are currently sending out mail; - set up a new clean outgoing MTA using this IP address. This can be a new independent mailer, or just use the 2.7 Postfix reputation management mechanisms for outgoing IP selection with your existing mailer, along with added spam and virus filtering, and with DKIM signing (leaving your existing mail system and client requirements untouched for now); - redirect submitted mail from authenticated clients (some or all, or as an opt-in service) through this new clean outgoing mail path. They will benefit with a much better acceptance rate at Yahoo. - check mail archives on the postfix user list (or ask) for some advice on best approaches to feed mail to yahoo and other large MSP providers; a dedicated Postfix smtp (client) service for each of the large players may be in order, with some restraint on the number of parallel outgoing sessions. A carrot and a stick method - carrot first :) The above only applies to clients using in their From header filed one of your (ISP's or their own) domain names. Those using foreign domains like gmail or yahoo should be submitting through their mail submission service anyway, for best mail acceptance. You can still allow them to send through your 'clean' or regular mailers, except they won't be able to obtain a signature from their 'home' domain. Mark
