discussion Guide Plesk MailBaby SMTP Setup Guide on Plesk Panel 2025 (with Postfix Configuration)

[CL4Y]

Using an external SMTP service for email delivery can prevent your server’s IP from being blacklisted and significantly improve your deliverability rate.
In this guide, we’ll explain step-by-step how to integrate the MailBaby SMTP service with servers using Plesk Panel.

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🧩 1. Add X-Sender Header Configuration​

First, create a custom header rule for MailBaby:

nano /etc/postfix/header_custom

Add the following line:

/^Received: (.*Authenticated sender:)([^)]*)(.*)/i PREPEND X-Sender-id: $2

Save and exit with CTRL + X, then Y, and finally Enter.

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🔐 2. Define SMTP Credentials​

nano /etc/postfix/sasl_passwd

Edit the content as follows:

relay.mailbaby.net mbXXXX:XXXXXXX

Replace mbXXXX:XXXXXXX with your MailBaby account’s username and password.

Set proper permissions:

chown root:root /etc/postfix/sasl_passwd
chmod 600 /etc/postfix/sasl_passwd
postmap hash:/etc/postfix/sasl_passwd

NOTE: Run these commands in the correct order.

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⚙️ 3. Configure Postfix Settings​

Open the main configuration file:

nano /etc/postfix/main.cf

Add the following lines at the bottom:

relayhost = relay.mailbaby.net:25
smtp_sasl_auth_enable = yes
smtp_sasl_password_maps = hash:/etc/postfix/sasl_passwd
smtp_sasl_security_options = noanonymous
smtpd_sasl_authenticated_header = yes
smtp_tls_security_level = encrypt
smtp_header_checks = regexp:/etc/postfix/header_custom

To quickly reach the bottom of the file, use CTRL + V.

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🔁 4. Update Configuration and Restart Service​

Verify Postfix configuration:

postconf

Restart the service:

service postfix restart

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🌐 5. Update SPF Record​

Add the following SPF record to your domain’s DNS settings:

v=spf1 a mx include:relay.mailbaby.net ~all

This record authorizes MailBaby servers to send emails on behalf of your domain.

 

[CL4Y]

If you need help, you can leave a message below. You may need to wait a while after SPF updates for the settings to take effect on the DNS side.