To use the SMTP server, you need credentials tied specifically to your dedicated sending domain. Each domain has its own set of SMTP credentials — they are not shared across domains or at the agency level.
This article covers how to create, reset, and delete SMTP credentials; which ports are supported; email and credential limits; pricing; and where to find IMAP settings for receiving email.
How to Create SMTP Credentials
SMTP credentials are created at the sub-account level under a dedicated domain — not at the agency level, and not for agency-assigned domains.
Go to Email Service → SMTP Service → Dedicated Domain and IP → SMTP Settings under your dedicated domain.
Click Create New SMTP User and enter a username and password for the credential.
The platform uses an automated approval system for SMTP access. Eligible sub-accounts can create credentials immediately. If your account is not approved, the Create New SMTP User button may be disabled or you may see a warning message.
What Ports Does Mailgun Support?
The SMTP server (smtp.mailgun.org) listens on the following ports:
| Port | Protocol | Use When |
|---|---|---|
| 25 | Standard SMTP | Server-to-server relaying (often blocked by ISPs for client use) |
| 465 | SSL/TLS | Clients requiring implicit TLS from the start of the connection |
| 587 | STARTTLS | Recommended for most email clients and SMTP plugins |
| 2525 | Alternative SMTP | Fallback when ports 25, 465, and 587 are blocked |
How to Reset SMTP Password
To reset the password for an existing SMTP credential, locate the credential in your domain's SMTP Settings and click the reset option. In the confirmation modal, click Reset Password to finalize the change.
How to Delete SMTP Credential
To remove an SMTP credential, locate it in your domain's SMTP Settings and click Delete. Confirm the deletion in the pop-up modal.
Limits for SMTP and Emails
A maximum of five SMTP credentials can be created for each dedicated domain.
Each account is limited to 1,500 emails per day.
If the daily email limit is exceeded, all SMTP credentials will be automatically deleted from all dedicated domains on the account.
LC Email Pricing
LeadConnector email is priced at $0.675 per 1,000 emails — lower than most major SMTP providers (Mailgun charges $0.80/1,000). All plans use the same per-email rate.
Email charges are deducted from your account credits and can be reviewed at Agency View → Billing → Credits.
Where to Find IMAP Settings
Since mailboxes are not hosted here, POP and IMAP protocols are not supported. SMTP credentials cannot be used in IMAP settings.
IMAP is used to retrieve messages from your mailbox, while SMTP is for sending. If you need IMAP to read email in a client, you must get those settings from your email hosting provider — not from this platform.
Example — Google Workspace: Generate an app password in Google, then use:
For other providers, find IMAP settings in their own support documentation. Quick links:
If your provider isn't listed, contact them directly for IMAP hostname and port information.
Troubleshooting
This means SMTP credentials cannot be created for that domain at this time. This is controlled by an automated approval system. Eligible accounts get access immediately; others require manual review.
What to do:
- Contact Support to request SMTP access for your sub-account.
- Include your sub-account ID, the sending domain or subdomain, and a screenshot of the warning message.
Frequently Asked Questions
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