Mailrelay combines an SMTP relay with broadcast campaigns and is widely used by Spanish-speaking teams and high-volume European senders. The WordPress integration covers form capture and list sync; campaigns and reports stay in the Mailrelay panel. SleekView calls the Mailrelay REST API on a configurable interval and caches campaigns with delivered counts, opens, unique opens, click rate, hard and soft bounces, and unsubscribes.

SleekView Charts reads the cache and renders chart cards on one dashboard. A KPI of the average open rate across recent sends, a Donut of campaigns by Mailrelay group, a Bar of campaigns by bounce count, and an Area chart of weekly send volume. Each card is a saved query against the live cache.

Saved chart dashboards match the per-role rhythm. The newsletter editor keeps the open-rate KPI, list ops keeps the bounce bar to spot deliverability drift on specific groups, deliverability leads keep the weekly send area chart for sender-reputation context. Mailrelay stays the sender; the dashboard becomes the daily reading surface.

Mailrelay's audience skews toward higher-volume senders: e-commerce stores running daily promos, publishers running daily digests, agencies running campaigns for multiple clients off a shared sending infrastructure. At those volumes the per-campaign report in the Mailrelay panel is the right tool for a single deep-dive, but the cross-campaign questions that matter operationally (which group bounced the most this week, which cadence converts on which audience, which broadcasts hurt sender reputation) need a chart layer. SleekView Charts caches the Mailrelay API response locally and renders the answers as chart cards on one dashboard inside WP Admin.

Editors read the open-rate KPI, list ops reads the bounce bar, deliverability leads read the weekly send area chart. The data is the same data Mailrelay reports; the chart layer makes the cross-campaign questions answerable in one glance.