go-mailtester Local SMTP and IMAP Diagnostics

Explore this developer service’s ongoing no-cost allowance, restrictions and official documentation before deploying.

INCLUDED FREE ALLOWANCEFree MIT-licensed Go CLI for local SMTP and IMAP connection, TLS, authentication, mailbox and delivery diagnostics; no vendor-imposed usage quota or software expiry.

View official documentation

Plan details

What do these plan and deployment labels mean?

Plan: Ongoing free allowance
Deployment model: Local / embedded
Credit card: Not required
Commercial use: Allowed
Added to directory (UTC): 2026-11-09
Last checked: 2026-11-09

Important restrictions

Requires user-provided machine, network access and existing SMTP/IMAP servers. Sending test messages may incur provider charges or deliver real mail; do not expose credentials in shell history, and avoid -skip-verify outside controlled tests. No hosted mailbox, relay or infrastructure included.

View official documentation

Independent community listing, not affiliated with the provider. Always check the latest billing policy and quotas before enabling paid usage.