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feat: add SMTP as alternative to Mailgun for email delivery #7

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47 changes: 42 additions & 5 deletions config/runtime.exs
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Original file line number Diff line number Diff line change
Expand Up @@ -22,6 +22,13 @@ int_env = fn name, default ->
end
end

bool_env = fn name, default ->
case System.get_env(name) do
nil -> default
value -> value in ~w(true 1)
end
end

non_prod? = config_env() != :prod

api_default_request_size_cap = if non_prod?, do: 2_000_000, else: 1_000_000
Expand Down Expand Up @@ -168,11 +175,41 @@ if config_env() == :prod do
# pool_count: 4,
socket_options: maybe_ipv6

config :acai, Acai.Mailer,
adapter: Swoosh.Adapters.Mailgun,
api_key: System.get_env("MAILGUN_API_KEY"),
domain: System.get_env("MAILGUN_DOMAIN"),
base_url: System.get_env("MAILGUN_BASE_URL")
if smtp_host = System.get_env("SMTP_HOST") do
smtp_ssl = bool_env.("SMTP_SSL", false)

smtp_cacerts =
CAStore.file_path()
|> File.read!()
|> :public_key.pem_decode()
|> Enum.map(fn {_, der, _} -> der end)

smtp_tls_opts = [
versions: [:"tlsv1.2", :"tlsv1.3"],
verify: :verify_peer,
cacerts: smtp_cacerts,
depth: 99,
server_name_indication: String.to_charlist(smtp_host)
]

config :acai, Acai.Mailer,
adapter: Swoosh.Adapters.SMTP,
relay: smtp_host,
port: int_env.("SMTP_PORT", 587),
username: System.get_env("SMTP_USERNAME"),
password: System.get_env("SMTP_PASSWORD"),
ssl: smtp_ssl,
tls: if(smtp_ssl, do: :never, else: :always),
auth: :always,
tls_options: smtp_tls_opts,
sockopts: smtp_tls_opts
else
config :acai, Acai.Mailer,
adapter: Swoosh.Adapters.Mailgun,
api_key: System.get_env("MAILGUN_API_KEY"),
domain: System.get_env("MAILGUN_DOMAIN"),
base_url: System.get_env("MAILGUN_BASE_URL")
end

# See https://hexdocs.pm/swoosh/Swoosh.html#module-installation for details.
config :swoosh, :api_client, Swoosh.ApiClient.Req
Expand Down
11 changes: 10 additions & 1 deletion infra/.env.example
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Original file line number Diff line number Diff line change
Expand Up @@ -15,12 +15,21 @@
# devcontainer | devrelease | prod
CADDYFILE=devcontainer

### Mailgun (for sending emails)
### Email transport (choose one of the two options below)

# Option A: Mailgun
MAILGUN_DOMAIN=mail.example.com
# sender key for the above domain
MAILGUN_API_KEY=inject_with_secret_manager
MAILGUN_BASE_URL=https://api.eu.mailgun.net/v3

# Option B: Custom SMTP (takes priority over Mailgun when SMTP_HOST is set)
# SMTP_HOST=smtp.example.com
# SMTP_PORT=587
# [email protected]
# SMTP_PASSWORD=inject_with_secret_manager
# SMTP_SSL=false # set to true for implicit TLS / SMTPS (port 465); false = STARTTLS (port 587)

### Email sender configuration (for white-labeling)
# Display name in "From" field (defaults to your app name)
MAIL_FROM_NAME=My App
Expand Down
2 changes: 2 additions & 0 deletions mix.exs
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Original file line number Diff line number Diff line change
Expand Up @@ -42,10 +42,12 @@ defmodule Acai.MixProject do
[
{:argon2_elixir, "~> 4.0"},
{:bandit, "~> 1.10.4"},
{:castore, ">= 0.0.0"},
{:dns_cluster, "~> 0.2.0"},
{:ecto_psql_extras, "~> 0.8"},
{:ecto_sql, "~> 3.13"},
{:esbuild, "~> 0.10", runtime: Mix.env() == :dev},
{:gen_smtp, "~> 1.0"},
{:gettext, "~> 1.0"},
{:heroicons,
github: "tailwindlabs/heroicons",
Expand Down