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On-premise email delivery with live queue controls and response-based throttling

Collaborative email design alongside SMTP and API delivery

Application email delivery and isolated sandboxes for inspecting test messages

Self-hosted newsletters with SQL segments and configurable SMTP queues

Free no-signup email tools and guides for email marketers.

Small private-mail hosting with standard clients and catch-all addresses

Community email through webmail and IMAP/SMTP clients

Centrally managed S/MIME and PGP with a webmail fallback

Custom-domain alias routing with adjustable logging controls

Inspect Kubernetes network flows and service relationships through Cilium's CLI and optional service-map interface.

Carry a click identifier through campaign conversion data and compare marketing performance.

A Java-based load-testing application for exercising services and analyzing their performance under simulated traffic.

Hosted email delivery with sender-domain setup, templates and message records

Self-hosted email delivery with per-server queues, retention and message investigation

Email API, SMTP and campaigns with batched event notifications

Email delivery with retry keys, inbound mail and contact-based broadcasts

Twilio provides APIs and tools for SMS, voice, email, and customer engagement.

Email-client tracker controls with PGP and S/MIME options

Email campaigns, automations and transactional templates billed by sends

Maintained peer-to-peer virtual networking from the n2n lineage

Transactional email, campaign broadcasts and event-triggered workflows in one platform

Email delivery and stream-level monitoring for teams managing multiple senders

Application email with distinct transactional and broadcast message streams

Transactional email sending and inbound messages forwarded as JSON