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, even legitimate campaigns can vanish into spam. Common triggers include high bounces, spam complaints, poor list hygiene, missing authentication (SPF, DKIM

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

domain SPF authorises your sending IPs. DKIM signs each message. DMARC aligns the two and tells receivers what to do on failure. 3. Warm up new IPs gradually If

domain SPF authorises your sending IPs. DKIM signs each message. DMARC aligns the two and tells receivers what to do on failure. 3. Warm up new IPs gradually If

ratesMonitor bounces and unsubscribes weeklyKeep DNS authentication (SPF, DKIM, DMARC) up to date Cancelling the fixed IP You can cancel the fixed IP option from