开发者生态 None Show HN：Posthorn，无需邮件服务器的自托管邮件 Posthorn The unified outbound mail layer for self-hosted projects。One gateway between every app you self-host and the tr the SMTP Posthorn 2026-05-27 craigmccaskill
开发者生态 None Show HN：E2a – 适用于 AI 代理的开源电子邮件网关 e2a — Email for AI agents Authenticated email gateway for AI agents。 the agents agent 2026-05-11 mnexa