TrulyInbox

TrulyInbox is an email warmup platform that prices by daily warmup emails rather than charging per connected account on paid plans. That model is attractive for teams managing many low-volume sender accounts, provided the daily warmup pool fits the workload.

Judged purely as an API. What the request contract guarantees on retry, how complete the webhook event coverage is, whether suppressions are readable and writable programmatically, and how much the message log retains when something needs debugging in production.

Against high-frequency programmatic sends where a missed delivery is a product failure, TrulyInbox covers event stream, and does not cover idempotency keys, webhook coverage, the suppressions API, batch sending, and SDK breadth. Whether that gap matters depends on how central those are to the build.

• Idempotency keys: No
• Webhooks: No
• Event stream: Yes
• Operating since: Not published
• Suppressions API: No
• Best published rate per 1,000: Tiers not published in comparable form
• Batch sending: No
• SDKs: None
• Deliverability: Not a sender. Tracks warmup behavior, deliverability score, account health, and ESP-level analytics on higher tiers.

Not a sender. Tracks warmup behavior, deliverability score, account health, and ESP-level analytics on higher tiers.

Teams that manage many sender accounts but want one shared warmup volume pool.

Teams that need a deliverability API today.