I a currently re-writing a web app from ASP to PHP and have come to the part where the app sends mass mailings to their customer base. This has always been problematic for them with the existing setup and I am looking for the best approach. While I've setup mailings with PHP, never such mass mailings. They will be using a web form to send sometimes 2-5MB attachments to thousands of customers to advertise new products with PDF's, etc. Using their Windows IIS SMTP virtual server smarthost function, I send their mail off-site to our postfix mail gateway, but it still bogs down and I'm sure a remote server is not the answer, but still better than the errors they receive trying to use localhost and IIS. Once the re-write, the app will be on to a Linux box where I can do some tweaking to these and hope localhost will work better for these mailings. Can someone give some pointers at how I may want to approach such mass mailings? Thanks in advance!
If you have attachments, you could use one or more cheap remote servers and Bcc: the recipients. Or use the local mail gateway. Bcc:ing will cut down on the amount of the amount of actual data transferred to the mail server; you can send to say 100 recipients at once but only transfer the attachment data once.
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