As we continue to move forward planning and developing our future multi-server solutions (including those designed and priced appropriately for our mid-sized hoster customers such as you guys), one area that has come up is that of e-mail. We are considering the possibility of not supporting qmail in the new product (but would like your feedback before making any decisions). As we develop upgrade paths from H-Sphere to this new product, it may transition some backend pieces such as: qmail -> Postfix or ezmlm -> mailman. This does bring up some interesting scenarios, and we'd like your opinion. Benefits: - Postfix is an actively maintained mail server package widely used in production environments (qmail is not) - Faster e-mail throughput (around 2-3x more mail/second) - Better scalability (we have found that qmail performance significantly degrades above 20 mail/second) - More standard configuration file formats and options for customizing the mail server (including greater availability of community assistance) - More unified codebase vs. qmail (which typically contains many third-party patches) - Simplified setup and possible lower support incident rate from clients - More extendable via Milter MTA protocol Differences: - For anti-spam, the only notable difference is that spam mails will no longer be forwarded to an address, but instead relocated to a folder in the same mail account - Some features such as: sender filters, ability to discard incoming messages, client's ability to tune greylisting, DKIM and SPF will not be supported So - generally we'd like to know if these sorts of changes would be acceptable? Are there other concerns you could have about this scenario? Thanks!