Content
Background information
When receiving an email it is in principle difficult to verify that the sender is who he says he is. Normally this is done by checking whether the sending mail server uses the same domain as the sender domain name. This fails when mail is being sent via a third party such as is the case with when sending mail via Easydus.
DKIM
DKIM is an optional addition to the mail protocol to solve this problem. It is based on a digital signature that is added to the sent email. This signature has a public key that can be verified. This public key you need to set in your DNS settings. When done the spam filters can control that who the sender is authorized and the mail is most likely not spam.
Easydus sends email via Mailjet. Mailjet always adds a DKIM signature, a mail signed by someone other than the sender is always more reliable than an unsigned mail.
So when a customer does not use DKIM signing, Mailjet will mail with the Easydus DKIM signing. Through setting up DKIM prevents some mail clients show “sent on behalf of easydus” or something like that. It is therefore superior to add Mailjet in your DNS-settings.
SPF
SPF works with a list of servers which may or may not have permission to email on behalf of the domain. The receiving server can check the sending mail server against this list. This, however, provides no guarantee that the email is fiddled. DKIM does,
DKIM is the better solution and would have to make SPF redundant, but not all receivers support both. It is a good idea and easy to configure as both DKIM and SPF
Validation ownership domain
In order to have optimal spam ratings Mailjet will only mail from domains of which ownership is validated.
For example to mail from jack.jones@company-a.com to Mailjet must be proven that the owner of company-a.com allows it. This is being done by adding an unique – by Easydus provided – code to add to the DNS records. You can instruct the person responsible as described below.
What to do?
Get the codes by sending an email to support@easydus.com containing the relevant domain, which your domain administrator needs to set up the DNS.
Domain correctly set
How the sender data are presented to the receiver depends on receiving mail server and the mail software the receiver is using. Example given:
- Sender Name < Jack Jones >
- Sender Email < jack.jones@company-a.com >
Domain not set in Mailjet
As discussed Mailjet does not allow sending by a not validated domain.
To enable sending anyway in this situation, we do the following (as a temporary solution):
Given these settings in Easydus.
| Sender Email | jack.jones@company-a.com |
| Sender Name | Jack Jones |
| Sender Email | jack.jones.company-a.com@easydusmail.com | Because we are not validated to mail on behalf of company-a.com we mail from an alternative domain owned by us. We send from an email address that clearly reveals the sender. |
| Sender Name | Jack Jones | The sender name most of the time is shown prominently, it stays unchanged. |
| Reply address | jack.jones@company-a.com | We add the original sending address as extra information (as a so called reply-to header) in order to to mail replies to the original address. |
Mochten er nog onduidelijkheden zijn, neem dan contact op met support@easydus.com
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