server: Send an email with the test command

server/src/infra/mail.rs

@@ -0,0 +1,31 @@
+use crate::infra::configuration::MailOptions;
+use anyhow::Result;
+use lettre::{
+    message::Mailbox, transport::smtp::authentication::Credentials, Message, SmtpTransport,
+    Transport,
+};
+use log::debug;
+
+pub fn send_test_email(to: Mailbox, options: &MailOptions) -> Result<()> {
+    let from = options
+        .from
+        .clone()
+        .unwrap_or_else(|| "LLDAP <nobody@lldap>".parse().unwrap());
+    let reply_to = options.reply_to.clone().unwrap_or_else(|| from.clone());
+    debug!(
+        "Sending email to '{}' as '{}' via '{}'@'{}':'{}'",
+        &to, &from, &options.user, &options.server, options.port
+    );
+    let email = Message::builder()
+        .from(from)
+        .reply_to(reply_to)
+        .to(to)
+        .subject("LLDAP test email")
+        .body("The test is successful! You can send emails from LLDAP".to_string())?;
+    let creds = Credentials::new(options.user.clone(), options.password.clone());
+    let mailer = SmtpTransport::relay(&options.server)?
+        .credentials(creds)
+        .build();
+    mailer.send(&email)?;
+    Ok(())
+}