Do you need to configure DKIM separately for our SMTP?
No. If your email application or platform already handles DKIM signing, our SMTP servers will preserve and deliver the DKIM signature as-is. No additional DKIM setup is required on our SMTP servers.
How DKIM works with IPwarmup SMTP?
IPwarmup.com provides SMTP relay servers. This means:
-
We do not modify or override DKIM signatures
-
We do not require customers to reconfigure DKIM inside IPwarmup
- DKIM is applied before the email reaches our SMTP servers
Typical Flow
If DKIM is already present when the email is submitted to SMTP, it will remain valid and intact.
Your Email App/Script → DKIM-signed Email → SMTP Server → Recipient Mailbox
Supported DKIM Scenarios
Scenario 1: Your app already signs DKIM (most common)
Examples:
-
Email platforms (MailWizz, Acelle, custom apps)
-
Libraries like PHPMailer, SwiftMailer, Nodemailer
-
ESP software with built-in DKIM
Result:
DKIM will pass automatically.
No manual action required on SMTP servers.
Scenario 2: Your SMTP provider signs DKIM automatically
If your application or sending stack signs DKIM before SMTP submission, our SMTP will relay the message without altering it.
Scenario 3: Your application does NOT sign DKIM
If your emails are not DKIM signed before they reach our SMTP server, DKIM will not be added automatically.
What you can do in this case?
-
Recommended: Configure DKIM within your email application or sending script.
-
Alternative: If your application does not support DKIM signing, you may open a support ticket and our team will assist with configuring DKIM at the SMTP level for your domain.
Note: Manual DKIM setup is handled by our support team and requires adding a simple DNS record to your domain.
Important Clarifications
-
Our SMTP servers do not require DKIM keys to be uploaded manually
-
IPwarmup does not force DKIM configuration inside the SMTP service
-
DKIM is not stripped or replaced
-
Our servers are fully compatible with DKIM, SPF and DMARC
