Current SMTP Configuration:
SMTP Host: smtp.office365.com
SMTP Port: 587
SMTP Username: wegweiser.db@agens-berlin.de
SMTP From: wegweiser.db@agens-berlin.de
SMTP From Name: admin

Test 1: Attempting to send test email to valid address...
Error sending email: Failed to send email: SMTP Error: The following recipients failed: test@example.com: Recipient address reserved by RFC 2606

Stack trace: #0 /var/www/html/wegweiser.germanywestcentral.cloudapp.azure.com/test_mail.php(29): SendMail->send()
#1 {main}

Test 2: Attempting to send test email to mix of valid and invalid addresses...
Error sending email: Failed to send email: SMTP Error: The following recipients failed: test@example.com: Recipient address reserved by RFC 2606

Stack trace: #0 /var/www/html/wegweiser.germanywestcentral.cloudapp.azure.com/test_mail.php(39): SendMail->send()
#1 {main}

Test 3: Attempting to send test email with empty recipient list...
Expected error: Failed to send email: No recipients specified