fix: set the right debug system property

.github/workflows/ci.yml

@@ -16,11 +16,15 @@ jobs:
 
     steps:
     - uses: actions/checkout@v3
-    - name: Set up JDK 11
-      uses: actions/setup-java@v3
+    - name: Setup sbt
+      uses: sbt/setup-sbt@v1
+
+    - name: Setup Java (temurin@11)
+      uses: actions/setup-java@v4
       with:
         java-version: '11'
         distribution: 'temurin'
         cache: 'sbt'
+
     - name: Run tests
       run: sbt ci

courier/src/main/scala/sessions.scala

@@ -31,7 +31,7 @@ object Session {
     def apply() =
       mailer.copy(_session = MailSession.getInstance(
         new Properties(System.getProperties) {
-        _debug.map(d => put("mail.smtp.debug", d.toString))
+        _debug.map(d => put("mail.debug", d.toString))
         _auth.map(a => put("mail.smtp.auth", a.toString))
         // enable ESMTP
         _startTls.map(s => put("mail.smtp.starttls.enable", s.toString))

integration-tests/src/test/scala/mailspec.scala

@@ -7,11 +7,11 @@ import scala.concurrent.duration._
 
 class MailSpec extends munit.FunSuite {
   // create a gmail app password https://myaccount.google.com/apppasswords
-  test("the mailer should send an email") {
-    assume(sys.env("CI").isEmpty(), "This test is meant to be ran locally.")
+  test("the mailer should send an email".ignore) { // remove .ignore to run the test locally
     val email = sys.env("IT_EMAIL")
     val password = sys.env("IT_PASSWORD")
     val mailer = Mailer("smtp.gmail.com", 587)
+                .debug(true)
                 .auth(true)
                 .as(email, password)
                 .startTls(true)()