📧 SMTP Setup Guide

Email Signatures in <span class="grad">Plesk</span>

Configure Badex Signature as your outgoing SMTP relay in Plesk Obsidian or Onyx. Professional signatures for all email accounts — server-side, no plugins.

📡 Badex SMTP Connection Settings
Outgoing Server
smtp.signature.badex.app
Port
587
Security
STARTTLS
Authentication
Normal password
Username
your-email@yourdomain.com
Password
your Badex SMTP password
✅
Before you start — make sure you have:
  • ✓ A Badex Signature account (start free trial)
  • ✓ Your email domain added in Badex dashboard → Domains
  • ✓ An SMTP account created in Badex dashboard → SMTP Accounts
  • ✓ DNS records configured (SPF, DKIM, DMARC)

Overview

Badex Signature integrates with Plesk by routing outbound email through our SMTP server. Signatures are injected server-side — your users don't need to configure anything in their email clients.

Method 1 — Plesk Mail Server Settings (Server-wide)

This configures Badex as the outgoing relay for all domains and accounts on your Plesk server.

Step 1 — Open Mail Server Settings

Log into Plesk as Administrator → Tools & Settings → Mail Server Settings.

Step 2 — Configure Relaying

Scroll to the Outgoing Mail section and fill in:

Relay host: smtp.signature.badex.app
Port: 587
SMTP authentication: Enabled
Username: your-email@yourdomain.com
Password: your Badex SMTP password
Connection security: STARTTLS

Step 3 — Save Settings

Click OK or Apply. Plesk's mail server (Postfix) will restart automatically.

Method 2 — Per Domain Configuration

To configure only for a specific domain (not server-wide):

Step 1 — Open Domain Mail Settings

Plesk → select your domain → Mail → Mail Settings.

Step 2 — Configure SMTP Relay

Look for Outgoing mail (SMTP) settings and enter the Badex server details as shown above.

Method 3 — Plesk Webmail (Roundcube)

Plesk includes Roundcube as its default webmail. To configure for individual users:

Open Roundcube → Settings → Preferences → Server Settings and enter the Badex SMTP details.

See our Roundcube guide for detailed steps.

Verify It's Working

Send a test email to Gmail. In Gmail, click ⋮ → Show original and verify:

SPF:   PASS with IP 157.173.98.136
DKIM:  PASS with domain yourdomain.com
DMARC: PASS
X-BADEX-Signature-Processed: 1
🎉 Done!

All outbound email from your Plesk server now has professional DKIM-signed signatures. Server-side injection — no client configuration needed.

Troubleshooting

❓ Relay access denied
Make sure the SMTP credentials are correct and the account exists in your Badex SMTP Accounts.
❓ Connection timeout on port 587
Some hosting providers block port 587. Contact your datacenter to unblock outbound SMTP port 587.
❓ Signature not appearing
Verify a Signature Policy is active in Badex and matches your domain or email address.
❓ Emails going to spam
Make sure SPF includes ip4:157.173.98.136 and DKIM record is correctly configured in DNS.
Other Platform Guides
🟠cPanel / WHM 🔵Plesk 🔷Roundcube 🟢DirectAdmin 🦊Thunderbird 📘Outlook 🍎Apple Mail

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