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authentication (SPF, DKIM, DMARC), or sudden spikes in sending. Symptoms: sudden drop in opens, rise in bounces/blocks, more complaints. Quick check: run a

on Swiss-hosted, authenticated infrastructure. What an ESP handles An ESP maintains sending IPs and their reputation, handles SPF, DKIM, and DMARC

from a poor configuration of the IP addresses or of the servers used for the campaign. A too intense sending rhythm or a failure to be identified by the SPF or

malicious links less effective. How to maximize image display Send from a verified domain with SPF, DKIM and DMARC.Maintain a clean list and a low complaint rate

authentication (SPF, DKIM, DMARC), the IP reputation, the content of the message and the validity of the recipient address. Most 5xx errors at scale come from one of those

. This pillar grades the message itself. Authentication (40%) — SPF, DKIM, DMARC and blacklist status across every sending domain. Why we weight them this way

requesting delisting.Speed up your delistingFind and document the cause.Fix authentication: SPF, DKIM, DMARC.Clean the list of hard bounces and inactives.Submit a

SPF and DKIM to your domain (we walk you through the DNS records).Import your contact list — CSV, Excel or paste-and-go. Optional plugins and integrations

Healthy is usually fixing authentication: SPF, DKIM and DMARC. A clean authentication setup typically adds 15 to 25 points on its own. Aim for healthy, not

hardened SMTP relay with TLS, DKIM signing, deliverability monitoring and free quota. Try Mailpro SMTP · Contact support Related reading: SPF configurationDKIM