Improve your delivery rates with DKIM and Sender ID signatures

DKIM signature

You’ve A/B tested a great email subject line and inserted a convincing from name. You hit send… and it turns out that your emails aren’t delivered to the inbox. At this point, you’d probably want to know how to increase email deliverability. Improve your newsletter delivery rate with DKIM and Sender ID. Newsletter2Go makes it easy to sign your emails with the DKIM process or by using sender ID. This will optimize your email delivery rate and make sure your emails always get delivered.

Furthermore, with some email clients (Gmail, for example), extra company information is shown, such as the Google+ page, and new entries on the Google+ page, when the email is delivered.

For the best results, we recommend using a sender ID entry. Read below about the benefits of both of these processes and how you can set them up. Before you learn about that, I’d like to explain first the terminology, so that you can get understand what the sender ID/ DKIM signature is all about.

What is DKIM?

DomainKeys Identified Mail (DKIM) is an email authentication method with the aim to detect email with a forget sender address. It enables the receiver to check whether an email claiming to come from a specific domain was indeed authorized by the domain owner. DKIM is compatible with the DNSSEC standard and with SPF. Learn more about DKIM here.

What is sender ID?

Sender ID is an anti-spoofing proposal, heavily based on the Sender Policy network (SPF).

How to set get top email delivery rates

Aside from an SPF record, which Newsletter2Go includes as standard, it is also possible to implement a sender ID entry and to use the DKIM process to sign your outgoing emails. If you’d like to make sure you improve your newsletter delivery rate fast, we recommend using both.

With the DomainKeys Identified Mail process (DKIM), outgoing emails are signed with the use of a public and private key. This allows the receiving server to establish whether the email actually stems from the sender address stated or not. DKIM is used primarily by large providers such as Gmail and Yahoo.

Tip: As standard, Newsletter2Go only sends emails using the DKIM process (with You can find more information below.

Sender ID is similar. The use of a sender ID tells Newsletter2Go’s servers to use your sending domain as a valid sender address. Sender ID is used primarily by Microsoft, as well as by Outlook, Hotmail and MSN.

The use of an SPF record, Sender ID and a DKIM entry all maximalize the trust your delivery receives. This, in turn, ensures the highest possible rate of delivery.

How do I activate this process?

SPF: Newsletter2Go uses a valid SPF record as standard. You do not have to do anything.

DKIM: All emails with Newsletter2Go customers are signed with a Newsletter2Go key. This ensures that your emails achieve a high and reliable delivery rate and are certified by the CSA. For optimised delivery rates we recommend the use of a DKIM entry.

To insert a DKIM entry, you need to carry out changes to your settings both in your own domain’s DNS settings and in your Newsletter2Go account. This is the only way to increase the level of trust you receive from the recipient’s server. To make this as easy as possible for you, we have created an option whereby you can create and validate your entry through us. And you only need 2 clicks! We also supply you with the necessary code that you need for the DNS entry.

DKIM, Sender ID, SPF


Log in to your account and go to ‘Settings‘. Under ‘Deliverability‘ you will find ‘DKIM’. Click on the right on ‘set up new domain‘. Enter the domain from which you would like to send emails over Newsletter2Go. (E.g if your sender address is [email protected], Once you have confirmed this entry a new window will open with the code that you need to place into your domain’s DNS settings. If you are unsure of how to do this, please contact your administrator. You can always find the code again by clicking on ‘show’ next to DKIM.

Now you need to place the DNS entry into your domain’s settings. When you have done this, log back into Newsletter2Go, go to ‘Settings‘ and click on the ‘check‘ button next to DKIM. This should then show a blue check mark next to your domain. After this, all your emails will automatically be signed with the DKIM key.

Sender ID: The use of a sender ID also requires a DNS entry.

DKIM, Sender ID, SPF


To set this up, first log into your account and go to ‘Settings‘. Under ‘Deliverability‘ you will find sender ID. Click on the right on ‘set up new domain‘ and enter the domain which you would like to use to send your emails. (E.g if your sender address is [email protected], enter If you do not know how to enter a DNS entry into your domain’s settings, please contact your administrator.

If there is already an SPF entry in your domain (begins with “v=spf1”), then please add the following code in the lower part (

If there is currently no SPF entry, please add one and then add the code from the field above. Once this is finished, you can check the settings from your Newsletter2Go account by clicking on the button ‘check’ next to sender ID. If a check mark appears next to sender ID, everything has worked perfectly. After this, all your emails will automatically be validated with sender ID when sent.

DKIM Sender ID SPF 2


The use of SPF, DKIM and sender ID helps prevent the categorization of your emails as spam. To ensure you get the best email delivery rate, use all three.


Since 90 percent of sent emails is now considered as spam, you need to make sure you do all it takes to increase email deliverability. Using a Sender ID/ DKIM signature to sign your emails with the DKIM process will definitely help you achieve better results. However, if you’d like to improve your newsletter delivery rate even further than with the DomainKeys Identified Mail, learn more about whitelisting. Then, use our free spam test to see how will your newsletter perform.

About the author

Stefania Goldman
Communications Manager

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