Upgrading Your Email Authentication to 2048-bit DKIM with BulkMail

Email authentication is an important part of maintaining reliable email delivery. To help strengthen the security of outgoing emails, BulkMail now supports 2048-bit DKIM authentication for sending domains.

This upgrade provides stronger cryptographic protection than older 1024-bit DKIM keys and helps businesses maintain modern email authentication standards.

Important: DKIM upgrades are managed by the BulkMail administration team. Customers cannot perform this upgrade themselves and should contact BulkMail support to request the change.

What Is DKIM?

DKIM (DomainKeys Identified Mail) is an email authentication method that helps receiving email providers verify that an email was authorised by the sending domain and has not been altered during delivery.

When an email is sent, a digital signature is added to the message. Receiving email providers use the public key published in the domain's DNS records to verify that signature.

DKIM works alongside other authentication methods, including SPF and DMARC, to help establish trust in outgoing email communications.

Why Is BulkMail Upgrading to 2048-bit DKIM?

Some existing sending domains use older 1024-bit DKIM keys.

The newer 2048-bit keys provide stronger cryptographic protection and follow current recommendations for email authentication.

The benefits include:

• Stronger email authentication: More robust cryptographic protection for outgoing messages.
• Improved security: Helps receiving email providers verify message authenticity and integrity.
• Modern authentication standards: Supports a more secure and up-to-date email sending configuration.
• Controlled migration: Existing DKIM authentication can remain active while the new configuration is verified and deployed.

Although stronger DKIM authentication supports email deliverability, it does not guarantee inbox placement. Mailing list quality, sender reputation and recipient engagement remain important.

How Do I Upgrade My DKIM Settings?

The DKIM upgrade is not a self-service feature for standard BulkMail customers.

Our administration team manages the upgrade process to ensure that the correct DKIM configuration is applied to your sending domain.

Step 1: Contact BulkMail Support

Contact our support team and request an upgrade to 2048-bit DKIM authentication.

Please provide the sending domain you would like us to review.

Step 2: BulkMail Reviews Your Configuration

Our administration team will review your existing DKIM configuration and determine the appropriate upgrade requirements.

Depending on your domain setup, additional DNS configuration may be required.

Step 3: Update DNS Records If Required

If DNS changes are necessary, our team will provide the relevant instructions.

You may need assistance from your domain hosting provider or IT administrator to make these changes.

Do not remove or modify your existing DKIM records unless instructed to do so by BulkMail support.

Step 4: Verification and Deployment

Once the required configuration is in place, the new DKIM settings must be verified and deployed.

Your existing DKIM key remains in use during the verification and deployment process.

BulkMail will guide you through any actions required from your side.

Will the Upgrade Affect My Email Campaigns?

The new DKIM upgrade process is designed to support a controlled transition.

Your existing DKIM key remains in use while the new settings are being verified and deployed.

This helps reduce the risk of disruption caused by changing authentication settings prematurely.

Customers should continue using their existing configuration unless BulkMail support advises otherwise.

Frequently Asked Questions

Is the 2048-bit DKIM Upgrade Mandatory?

We recommend using stronger DKIM authentication as part of maintaining a secure and modern email sending configuration.

Contact BulkMail support to confirm whether your sending domain requires an upgrade.

Can I Upgrade DKIM Myself?

No. Standard BulkMail customers cannot perform the upgrade themselves.

Our administration team manages the process and will provide any instructions required for your domain.

Do I Need Access to My DNS Settings?

Possibly. Depending on your domain configuration, you may need to add or update DNS records.

Our support team will advise you if any changes are required.

Will the Upgrade Improve My Email Deliverability?

Stronger DKIM authentication helps receiving email providers verify the authenticity of your messages.

However, deliverability also depends on factors such as sender reputation, list hygiene, recipient engagement and correct SPF and DMARC configurations.

Will My Existing DKIM Key Stop Working Immediately?

No. The upgrade process allows your existing DKIM key to remain in use while the new settings are verified and deployed.

Request Your DKIM Security Upgrade

Keeping your email authentication up to date is an important part of maintaining reliable business communications.

BulkMail's support team can assist you with reviewing your current configuration and arranging the upgrade to stronger 2048-bit DKIM authentication.

Would you like to upgrade your sending domain?

Contact our team and request a DKIM security upgrade. Include your sending domain so our team can review your configuration.

For additional information about DKIM authentication, see our DKIM validation documentation.