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I loved this [0] guide. You may not need the encrypted partition part of it so you can leave it out but I've followed it multiple times, all successfully. [0]

• aaronem 13y ago
  I mentioned the other day that I'd been thinking of writing a HOWTO for setting up a VPS as a mail server. Now I don't have to; your link is quite close to what I'd have written -- same VPS host, same SMTP and IMAP servers, very similar configurations -- except much better written, and also useful for people who care about at-rest encryption the way I don't. (I also do TLS via stunnel instead of natively in postfix and dovecot, for reasons I no longer remember, but it works quite well so I haven't bothered changing it.) Thanks for linking this! I'm planning on rebuilding my mail host pretty soon, since most of it's been untouched for almost a decade and I'm a much better sysadmin now than I used to be; that's not least evident in how I didn't bother to document anything the first time around, so having this HOWTO handy will save me a lot of time. (Edit on further reading: I tried Z-push, but the version I tried didn't support message flags, which I require; push also annoyed me and sucked more battery life than it was worth, so I disabled it and got rid of Z-push. And I don't see the need for Solr; Dovecot, I'm not sure what version but I set it up something like five years ago, gives me full-text message search for free.)