Authenticating Mailersend Emails with SPF and DKIM

Why are my Mailersend emails going to Spam?

If you have a problem with Mailersend emails going to spam, that is, going to the junk folder of your recipients, then it is very likely an issue with your email authentication. Emails failing authentication, be they failing SPF, failing DKIM, or failing DMARC is common, as SPF, DKIM, and DMARC are often not properly implemented by domain administrators. Often, the main cause of Mailersend emails being blocked is due to the Mailersend emails failing DMARC, which in the case of Mailersend, is usually due to a misconfiguration of SPF and DKIM.

How to stop Mailersend emails going to Junk.

The first step to preventing Mailersend email going to spam is to retrieve a failed message and access its header information. This will allow you to quickly diagnose whether any authentication issues such as DKIM or DMARC are flagging your email as spam, instructing the recipient sender to move it to junk. Simply paste the email headers into our free Stellastra Deliverability Tool, which you can use freely with no log in required. Our deliverability tool should allow you to avoid Mailersend emails from going to spam, or at least rule out authentication as the issue.

How to remove ‘via mailersend.com’ or ‘on behalf of mailersend.com’

Another example of where a Mailersend DKIM misconfiguration is to blame, is if your recipients report seeing the message as ‘via mailersend.com’ or ‘on behalf of mailersend.com’ and that the emails typically end up in spam or junk. The Stellastra Email Deliverability tool above will confirm this prognosis, however, you may also wish to configure DKIM for Mailersend by logging in to your Mailersend account to check to see if you have followed the following article to configure your Mailersend dkim setup to authenticate your domain.

How to stop Mailersend Failing DMARC

To ensure that your Mailersend campaigns pass DMARC and get delivered to your prospects, it is important to ensure that DKIM and SPF passes authentication for your domain. A common mistake is to sign an email with Mailersend’s own DKIM keys. However, in order for Mailersend’s email to pass authentication for your own domain, it is necessary to use your own DKIM keys as per Mailersend’s own guide. If you wish to verify the above, paste the message headers for a failed Mailersend message into our Mailersend email testing tool. Furthermore, you should also follow the instructions on how to set up SPF authentication for Mailersend.

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