SMTP Configuration
Your mail server address
Common ports: 25, 465, 587, 2525
Authentication username for your mail server
Authentication password for your mail server
Security protocol for SMTP connection
How the recipient will see who sent the email
The email address the test will be sent from
Where the test email will be delivered

Host: smtp.gmail.com, Port: 587 (STARTTLS) or 465 (SMTPS). Use App Password (2‑Step Verification required). From must match account or allowed alias.

Host: smtp.office365.com, Port: 587 (STARTTLS). SMTP AUTH must be enabled for the mailbox.

Yahoo: smtp.mail.yahoo.com (465 SMTPS, App Password). Zoho: smtp.zoho.com (587 STARTTLS or 465 SMTPS).

Timeout = port blocked by host or firewall. Try 587 or 2525. Use server hostname matching SSL certificate.

535/534: wrong password or provider requires App Password. Ensure SMTP AUTH is enabled on mailbox.

Check SPF/DKIM/DMARC. Use a From domain you own. Avoid port 25 on consumer ISPs.