Office 365 DKIM Generator

Generate DKIM records for Office 365 to enhance email security and prevent spoofing.

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About This Tool

This tool helps you create DKIM (DomainKeys Identified Mail) records specifically for Office 365. DKIM is an email authentication method that uses cryptographic signatures to verify that an email message was sent from an authorized domain and hasn't been tampered with. By generating and configuring DKIM records in your Office 365 DNS settings, you improve email deliverability, protect against email spoofing, and work towards DMARC compliance. Enter your domain, selector, and key length to generate the complete DKIM record ready for DNS configuration.

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How to Use

Enter your domain name (e.g., example.com).
Choose a selector (default is 'selector1').
Select the key length (1024 or 2048 bits).
Click 'Generate DKIM Record'.
Copy the generated DKIM record and add it to your DNS as a TXT record.
Follow the Office 365 setup instructions provided.

Frequently Asked Questions

Find Quick Answers

What is DKIM and why is it important for Office 365?

DKIM (DomainKeys Identified Mail) is an email authentication method that uses cryptographic signatures to verify that emails are sent from an authorized domain and haven't been altered. For Office 365, configuring DKIM helps prevent email spoofing, improves deliverability, and is required for DMARC compliance.

What key length should I choose: 1024 or 2048 bits?

2048-bit keys provide stronger security and are recommended for new setups. 1024-bit keys are still acceptable but may be phased out in the future. Office 365 supports both lengths.

Where do I add the generated DKIM record?

Add the DKIM record as a TXT record in your domain's DNS. The record name should be in the format: [selector]._domainkey.[yourdomain].com (e.g., selector1._domainkey.example.com).

How long does it take for DKIM to start working?

DNS changes typically propagate within a few minutes to 48 hours. After adding the record, you need to enable DKIM signing in your Office 365 admin center for it to take effect.

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