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Postmark is a robust email communication API designed to ensure reliable and efficient email delivery for applications. It is widely used by developers to send transactional emails, such as password resets, order confirmations, and notifications, with high deliverability rates.
When using Postmark, you might encounter an error indicating an 'Invalid Sender Signature.' This error typically manifests when attempting to send an email, and the system rejects the request due to a mismatch in the sender's signature.
The primary symptom of this issue is an error message stating 'Invalid Sender Signature' when sending emails through Postmark. This prevents emails from being sent successfully.
The 'Invalid Sender Signature' error occurs when the sender's signature does not align with the domain's DNS records. This misalignment can happen if the DNS records are not correctly configured or if there have been recent changes to the domain settings that have not been updated in Postmark.
DNS records are crucial for verifying the authenticity of the sender's domain. Postmark uses these records to ensure that the sender is authorized to send emails on behalf of the domain. If the DNS records do not match the sender signature settings in Postmark, the system will reject the email.
Resolving the 'Invalid Sender Signature' error involves updating the sender signature settings to align with the DNS records. Follow these steps to fix the issue:
First, check your domain's DNS records to ensure they are correctly configured. You can use tools like MXToolbox to verify your DNS settings.
Log in to your Postmark account and navigate to the 'Sender Signatures' section. Ensure that the sender signature matches the DNS records. If there are discrepancies, update the sender signature to reflect the correct domain settings.
After updating the sender signature, re-verify your domain in Postmark. This step ensures that the changes are recognized and that the domain is authorized to send emails. Follow the verification process outlined in the Postmark documentation.
By ensuring that your sender signature settings align with your domain's DNS records, you can resolve the 'Invalid Sender Signature' error in Postmark. This alignment is crucial for maintaining the integrity and deliverability of your emails. For more detailed guidance, refer to the Postmark Support page.
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