Now that you are hopefully aware of the importance of email delivery, we will present the most important technical and organizational measures you can take to positively influence the rate of successful delivery of your emails.
Sender Policy Framework (SPF)
An SPF record that defines the authorized mail servers and a DKIM signature for all emails sent are mandatory. Based on this, an alignment of the sender, mail server and DKIM domain is highly recommended in order to meet the DMARC requirements so that you can benefit from the DMARC policies and DMARC reporting of the mailbox providers that support DMARC.
Brand Indicators for Message Identification (BIMI)
Building on DMARC, we recommend a logo based on the BIMI standard with a VMC certificate. This means that every email in the inbox of mailbox providers that support BIMI will be displayed with the logo you have chosen - a kind of visual seal of approval that the email has been checked and the sender is legitimate.
Pointer Records (PTR records)
All mailbox providers expect a PTR record in the DNS record uk phone number data of the sender domain to ensure that the IP address is assigned to the sender domain . A List-Unsubscribe header or a List-Help header are also highly recommended, as many mailbox providers allow email recipients to unsubscribe from further emails directly in their mailbox without having to search for unsubscribe links in the emails.
feedback loops
Some mailbox providers offer a feedback loop. This informs senders about unsubscribes and spam complaints so that they can react accordingly. It is also advisable to check the most important blacklists (RBLs) to determine whether the sender's mail server is listed on important block lists.
whitelisting
CSA whitelisting improves email deliverability by adding the sender to a mailbox provider's trusted list . Anyone who uses an ESP represented in Germany generally benefits from its CSA membership.
spam traps
Spam trap addresses are an increasingly important issue. These are test addresses from mailbox providers that are scattered across websites and that have definitely never been registered on a mailing list. Anyone who has such addresses in their mailing list is reducing the delivery rate of their mailing list because spam trap addresses are an indication that the sender does not always obtain consent from their email recipients.