Many WordPress booking systems such as Booknetic, Amelia, Bookly, and LatePoint rely on email notifications to send booking confirmations, appointment reminders, cancellations, and customer communications. While Gmail SMTP is a popular option, it does not always work reliably due to Google’s security policies, authentication requirements, server restrictions, or sending limitations.

If Gmail SMTP is failing, using a standard SMTP service is often the most reliable solution.

Why Gmail SMTP May Not Work

Common reasons include:

• Google blocks less secure authentication methods.

• Two-factor authentication (2FA) is not enabled.

• App Passwords are not configured correctly.

• Hosting providers block outbound connections to Gmail SMTP servers.

• Gmail sending limits have been exceeded.

• Authentication errors caused by Google security checks.

When these issues occur, switching to a dedicated SMTP service can provide better deliverability and reliability.

Information You Need Before Configuring SMTP

Your email provider should supply the following information:

• SMTP Server (Hostname)

• SMTP Port

• Encryption Type (SSL or TLS)

• Username

• Password

A typical SMTP configuration looks like this:

SMTP Hostname: mail.yourdomain.com

SMTP Port: 587

SMTP Secure: TLS

Username: booking@yourdomain.com

Password: Your Email Password

SMTP Settings for Common Email Providers

cPanel Hosting Email

Most web hosting companies provide email services through cPanel.

Example configuration:

SMTP Hostname: mail.yourdomain.com

SMTP Port: 587

SMTP Secure: TLS

Username: booking@yourdomain.com

Password: Your Email Password

Microsoft 365

SMTP Hostname: smtp.office365.com

SMTP Port: 587

SMTP Secure: TLS

Username: booking@yourdomain.com

Password: Your Email Password

Zoho Mail

SMTP Hostname: smtp.zoho.com

SMTP Port: 587

SMTP Secure: TLS

Username: booking@yourdomain.com

Password: Your Email Password

Google Workspace

SMTP Hostname: smtp.gmail.com

SMTP Port: 587

SMTP Secure: TLS

Username: booking@yourdomain.com

Password: Google App Password

How to Configure SMTP in Booknetic

1. Log in to your WordPress Admin Dashboard.

2. Navigate to Booknetic → Settings.

3. Open Integrations Settings → Email Settings.

4. Select SMTP as the Mail Gateway.

5. Enter the SMTP details provided by your email service provider.

6. Save the settings.

7. Send a test email to verify the connection.

How to Configure SMTP in Amelia

1. Log in to WordPress Admin.

2. Navigate to Amelia → Settings.

3. Open the Notifications section.

4. Choose SMTP as the email sending method.

5. Enter your SMTP server information.

6. Save the settings.

7. Send a test notification.

Recommended SMTP Ports

The most commonly used SMTP ports are:

For most providers, TLS on Port 587 is the preferred option.

Troubleshooting SMTP Errors

Authentication Failed

Possible causes:

• Incorrect username or password

• App Password not configured correctly

• Incorrect email address

Connection Timed Out

Possible causes:

• Firewall restrictions

• Hosting provider blocking SMTP ports

• Incorrect SMTP hostname

Emails Are Sent But Not Received

Possible causes:

• Missing SPF, DKIM, or DMARC records

• Emails landing in spam folders

• Poor domain reputation

Best Practices

For businesses that rely heavily on appointment bookings and customer notifications, using a professional email service is highly recommended. This improves email deliverability, reduces spam issues, and ensures customers receive important booking updates.

Popular options include:

• Microsoft 365

• Google Workspace

• Zoho Mail

• Brevo

• Mailgun

• Amazon SES

Using a dedicated SMTP service can significantly improve the reliability of appointment confirmation emails, reminder notifications, and customer communications across booking platforms such as Booknetic, Amelia, Bookly, and LatePoint.