On Wednesday 18 February 2009 16:56:05 jeffs wrote: > Sahil Tandon wrote: > > On Wed, 18 Feb 2009, jeffs wrote: > >> Thank you for your prompt reply. > > > > No problem, but please do not top-post; place all future replies *below* > > quoted text. Thanks. > > > >> I am working on a project in which -- depending on the level of the > >> users subscription -- either their mail is delayed for at least 2 hours > >> or it is sent out immediately. Actually, I could use some advice on the > >> best way to implement this. Because of the application in use all email > >> whether or not it belongs to one group or another, originates from the > >> same domain. It is an application sitting on the smtp server which > >> processes mail for the application. The users fill in a form and > >> depending on their level of subscription, the values from the form are > >> converted into an email message, go out right away or are delayed. So, > >> as far as the smtp server is concerned , all mail originates from the > >> same user but in fact gets destined for different recipients. The > >> application can ad tags or codes to the individual messages to indicate > >> which group they are in so perhaps if postfix can look inside the > >> message or something and see the tag or code, it can then decide if it > >> should delay or deliver immediately the message. > >> > >> I hope I'm making myself clear and please ask if you need clarification. > > > > Why not configure your application to inspect the mail and, depending on > > your criteria, submit to Postfix immediately or after a two hour delay?
Because he then creates a queue for an application that already has a queue. It's possible, but he'd have to create and maintain N queue directories, then let cron pick up each queue by inspecting the date header. > I did look at defer_transports and that looks promising. Would I simple > put defer_transports = smtp in the main.cf or do I have to fiddle with > other settings someplace too? I'd prefer something a little more > elegant than defer_transports unless I can, again, specify somehow which > mails are to be delayed. This sounds more like something for a policy server. Take a look at postgrey for example, it defers mail based on criteria postfix does not care about. All information is available to a policy server to enforce the delay policy you're describing. -- Melvyn Sopacua
