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When you are running a site with large mailing lists or on a slow or overburdened server, you can speed up the performance of your mailing list functionality quite drastically by using an email component that queues outgoing email. We refer to email components that do this as Queuing components. Currently, the only components that fill this criteria are Microsoft’s CDONTS and CDOSYS, and ServerObjects.com’s ASPQMail. A couple notes on these components:
- ASPQMail is a different product than ASPMail from the same vendor.
- CDOSYS must be configured by your host for queuing by configuring the Microsoft SMTP service to forward outbound mail properly in order to use it in this mode. To using the queuing functionality, you would use the CDOSYS PICKUP method as opposed to the direct method (which is just labeled CDOSYS).
By using email queuing, your site appears to run faster by freeing up system resources sooner. With most email components, the server tries to send each message as the application is running. If you have a lengthy email list, it can take a significant amount of time to go through the entire list, contact and send a request to each and every email server for every single message. However, if you are using an email component that does email queuing, then your site will send all the requests to the email component very quickly while the email component creates a list of the messages to send at it’s leisure in the background. The email messages will then be sent out in the background by the email component, and your site will not have to wait for them to finish sending. The end result is that your administrative email functions will run more quickly and efficiently.
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