I have a noisy app that spits out about 30 necessary emails per day. The recipients are indicating it crowds their inboxes and takes longer to consume than before. I cannot fix the app's rate of output. How might you go about setting up a CentOS+PostFix server to receive emails to a specific address and redistribute all emails in some interval (or on some time schedule) as one with a static body content and attachments?
Use a mailing list software that is able to sent out digests instead. Sent mails to this lists and have users subscribe to them.