updated Readme, add test and notes

tests/run_tests_manually.md

@@ -0,0 +1,41 @@
+
+## Check db logs
+`sqlite3 smtp_server.db "SELECT message_id, rcpt_tos, status FROM email_logs;"`
+
+## Send emails using python script:
+`python tests/send_email.py --port=4025 --porttls=40587 --recipient 'info@example.com'`
+
+## Linux send emails using `swaks`
+```bash
+swaks --to info@example.com \
+      --from test@example.com \
+      --server localhost \
+      --port 4025 \
+      --auth LOGIN \
+      --auth-user test@example.com \
+      --auth-password testpass123 \
+      --data "Subject: Test Email - authenticated\n\nThis is the message body."
+
+swaks --to info@example.com \
+      --from test@example.com \
+      --server localhost \
+      --port 40587 \
+      --auth LOGIN \
+      --auth-user test@example.com \
+      --auth-password testpass123 \
+      --tls \
+      --data "Subject: Test via STARTTLS - authenticated\n\nThis is the body."
+
+swaks --to info@example.com \
+      --from test@example.com \
+      --server localhost \
+      --port 40587 \
+      --tls \
+      --data "Subject: Test via STARTTLS - no auth\n\nThis is the body."
+
+swaks --to info@example.com \
+      --from test@example.com \
+      --server localhost \
+      --port 4025 \
+      --data "Subject: Test Email - no auth\n\nThis is the message body."
+```