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Installing and configuring chasquid

Installation

If you're using Debian or Ubuntu, chasquid can be installed by running sudo apt install chasquid.

To get, build and install the source, you will need a working Go environment.

# Get the code and build the binaries.
go get blitiri.com.ar/go/chasquid
cd "$GOPATH/src/blitiri.com.ar/go/chasquid"
make

# Install the binaries to /usr/local/bin.
sudo make install-binaries

# Copy the example configuration to /etc/chasquid and /etc/systemd, and create
# the /var/lib/chasquid directory.
sudo make install-config-skeleton

Configuration

The configuration is in /etc/chasquid/ by default, and has the following structure:

- chasquid.conf      Main config file.

- domains/           Domains' data.
  - example.com/
    - users          User and password database for the domain.
    - aliases        Aliases for the domain.
  ...

- certs/             Certificates to use, one dir per pair.
  - mx.example.com/
    - fullchain.pem  Certificate (full chain).
    - privkey.pem    Private key.
  ...

Note the certs/ directory layout matches the one from certbot, letsencrypt's default client, so you can just symlink certs/ to /etc/letsencrypt/live.

Make sure the user you use to run chasquid under ("mail" in the example config) can access the certificates and private keys.

Adding users

You can add users with:

chasquid-util user-add user@domain

This will also create the corresponding domain directory if it doesn't exist.

Checking your configuration

Run chasquid-util print-config to parse your configuration and display the resulting values.

Checking your setup

Run smtp-check yourdomain.com, it will check:

It needs to access port 25, which is often blocked by ISPs, so it's likely that you need to run it from your server.

Greylisting, anti-spam and anti-virus

chasquid supports running a post-DATA hook, which can be used to perform greylisting, and run anti-spam and anti-virus filters.

The hook should be at /etc/chasquid/hooks/post-data.

The one installed by default is a bash script supporting:

To use them, they just need to be available in your system.

For example, in Debian you can run the following to install all three:

apt install greylistd spamc clamdscan
usermod -a -G greylist mail

Note that the default hook may not work in all cases, it is provided as a practical example but you should adjust it to your particular system if needed.