We'd like to move our mail servers to Linux/Intel running SendMail. We're running Solaris/SPARC and SunONE e-mail. Can you tell us ahead of time what type of problems could occur in this move? Also, is SendMail going to be sufficient for serving 280 users?
Several years ago, I moved a production SendMail system that supported 500+ users from a Sun SPAR environment to a Linux PC, with barely a hiccup. Linux has a reputation for being tailor made for Web and e-mail servers. The number you mention should be more than sufficient.
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Make sure you get the processor, memory and disk you need for your environment, and you should be good to go. Don't modify sendmail.cf with linuxconf; you could run into problems. Obviously the administration tools are different as far as the OS is concerned -- which may be your biggest challenge -- but overall SendMail is SendMail. If you know how to run an e-mail system, you should be fine.
Here's a PDF I found somewhere; it summarizes some of the issues you may come across: http://www.bynari.net/LinuxMigration.pdf.
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