diff --git a/README.md b/README.md index fd9b990..fc2bb70 100644 --- a/README.md +++ b/README.md @@ -100,200 +100,7 @@ For a complete list of options, see `default.nix`. ## How to Set Up a 10/10 Mail Server Guide -Mail servers can be a tricky thing to set up. This guide is supposed to run you -through the most important steps to achieve a 10/10 score on `mail-tester.com`. - -What you need: - - * A server with a public IP (referred to as `server-IP`) - * A Fully Qualified Domain Name (`FQDN`) where your server is reachable, - so that other servers can find yours. Common FQDN include `mx.example.com` - (where `example.com` is a domain you own) or `mail.example.com`. The domain - is referred to as `server-domain` (`example.com` in the above example) and - the `FQDN` is referred to by `server-FQDN` (`mx.example.com` above). - * A list of domains you want to your email server to serve. (Note that this - does not have to include `server-domain`, but may of course). These will be - referred to as `domains`. As an example, `domains = [ example1.com, - example2.com ]`. - -### A) Setup server - -The following describes a server setup that is fairly complete. Even though -there are more possible options (see `default.nix`), these should be the most -common ones. - -```nix -{ config, pkgs, ... }: -{ - imports = [ - (builtins.fetchTarball "https://github.com/r-raymond/nixos-mailserver/archive/v2.1.3.tar.gz") - ]; - - mailserver = { - enable = true; - fqdn = ; - domains = [ ]; - - # A list of all login accounts. To create the password hashes, use - # mkpasswd -m sha-512 "super secret password" - loginAccounts = { - "user1@example.com" = { - hashedPassword = "$6$/z4n8AQl6K$kiOkBTWlZfBd7PvF5GsJ8PmPgdZsFGN1jPGZufxxr60PoR0oUsrvzm2oQiflyz5ir9fFJ.d/zKm/NgLXNUsNX/"; - - aliases = [ - "postmaster@example.com" - "postmaster@example2.com" - ]; - - # Make this user the catchAll address for domains example.com and - # example2.com - catchAll = [ - "example.com" - "example2.com" - ]; - }; - - "user2@example.com" = { ... }; - }; - - # Extra virtual aliases. These are email addresses that are forwarded to - # loginAccounts addresses. - extraVirtualAliases = { - # address = forward address; - "abuse@example.com" = "user1@example.com"; - }; - - # Use Let's Encrypt certificates. Note that this needs to set up a stripped - # down nginx and opens port 80. - certificateScheme = 3; - - # Enable IMAP and POP3 - enableImap = true; - enablePop3 = true; - enableImapSsl = true; - enablePop3Ssl = true; - - # Enable the ManageSieve protocol - enableManageSieve = true; - - # whether to scan inbound emails for viruses (note that this requires at least - # 1 Gb RAM for the server. Without virus scanning 256 MB RAM should be plenty) - virusScanning = false; - }; -} -``` - -After a `nixos-rebuild switch --upgrade` your server should be good to go. If -you want to use `nixops` to deploy the server, look in the subfolder `nixops` -for some inspiration. - - -### B) Setup everything else - -#### Step 1: Set DNS entry for server - -Add a DNS record to the domain `server-domain` with the following entries - -| Name (Subdomain) | TTL | Type | Priority | Value | -| ---------------- | ----- | ---- | -------- | ----------------- | -| `server-FQDN` | 10800 | A | | `server-IP` | - -This resolved DNS equries for `server-FQDN` to `server-IP`. You can test if your -setting is correct by - -``` -ping -64 bytes from (): icmp_seq=1 ttl=46 time=21.3 ms -... -``` - -Note that it can take a while until a DNS entry is propagated. - -#### Step 2: Set rDNS (reverse DNS) entry for server -Wherever you have rented your server, you should be able to set reverse DNS -entries for the IP's you own. Add an entry resolving `server-IP` to -`server-FQDN` - -You can test if your setting is correct by - -``` -host -.in-addr.arpa domain name pointer . -``` - -Note that it can take a while until a DNS entry is propagated. - -#### Step 3: Set `MX` Records - -For every `domain` in `domains` do: - * Add a `MX` record to the domain `domain` - - | Name (Subdomain) | TTL | Type | Priority | Value | - | ---------------- | ----- | ---- | -------- | ----------------- | - | `domain` | | MX | 10 | `server-FQDN` | - -You can test this via -``` -dig -t MX - -... -;; ANSWER SECTION: - 10800 IN MX 10 -... -``` - -Note that it can take a while until a DNS entry is propagated. - -#### Step 4: Set `SPF` Records - -For every `domain` in `domains` do: - * Add a `SPF` record to the domain `domain` - - | Name (Subdomain) | TTL | Type | Priority | Value | - | ---------------- | ----- | ---- | -------- | ----------------- | - | `domain` | 10800 | TXT | | `v=spf1 ip4: -all` | - -You can check this with `dig -t TXT ` similar to the last section. Note -that `SPF` records are set as `TXT` records since RFC1035. - -Note that it can take a while until a DNS entry is propagated. If you want to -use multiple servers for your email handling, don't forget to add all server -IP's to this list. - -#### Step 5: Set `DKIM` signature - -In this section we assume that your `dkimSelector` is set to `mail`. If you have a different selector, replace -all `mail`'s below accordingly. - -For every `domain` in `domains` do: - * Go to your server and navigate to the dkim key directory (by default - `/var/dkim`). There you will find a public key for any domain in the - `domain.txt` file. It will look like - ``` - mail._domainkey IN TXT "v=DKIM1; r=postmaster; g=*; k=rsa; p=" ; ----- DKIM mail for domain.tld - ``` - * Add a `DKIM` record to the domain `domain` - - | Name (Subdomain) | TTL | Type | Priority | Value | - | ---------------- | ----- | ---- | -------- | ----------------- | - | mail._domainkey.`domain` | 10800 | TXT | | `v=DKIM1; p=` | - - -You can check this with `dig -t TXT mail._domainkey.` similar to the last section. - -Note that it can take a while until a DNS entry is propagated. - - -### C) Test your Setup - -Write an email to your aunt (who has been waiting for your reply far too long), -and sign up for some of the finest newsletters the Internet has. Maybe you want -to sign up for the [SNM Announcement List](https://www.freelists.org/list/snm)? - -Besides that, you can send an email to [mail-tester.com](https://www.mail-tester.com/) and see how you score, -and let [mxtoolbox.com](http://mxtoolbox.com/) take a look at your setup, but if you followed -the steps closely then everything should be awesome! - +Check out the [Complete Setup Guide](https://github.com/r-raymond/nixos-mailserver/wiki/A-Complete-Setup-Guide) in the project's wiki. ## How to Backup