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In short, you simply need to turn on email authentication for your account.
Every new ICDSoft customer gets DKIM and SPF enabled by default.
And we also offer Free Migration with every account (which Most other service providers should have a similar easy way to enable support for these two technologies.
Based on the result of this check and the failure policy () uses public key cryptography to sign messages.
The downside of this method is that it requires changes to the mail server software, as opposed to SPF, which requires publishing a single DNS record.
The Spam filters we use at ICDSoft use both of these techniques in order to improve spam recognition and classification. The SPF DNS record specifies the allowed sending (SMTP) servers for the domain name.
When you use SPF, you can list many different SMTP servers without any configuration needed on the SMTP server itself. The check is basic – when the server receives an email, it checks if the sending server’s IP address is listed in the SPF DNS record of the sender’s domain.
This requires the cooperation of your email administrator.