“自己搭个邮局发信”听起来酷，但送达率是劝退无数人的大坑。先看清再决定。
三大难点
- IP 信誉：很多 VPS 的 IP 在邮件黑名单里，你发的信直接进垃圾箱或被拒收。需要干净、无前科的 IP（见 原生 IP、IP 信誉）。
- 25 端口被封：大量商家默认封 SMTP 25 端口（防垃圾邮件），自建前必须确认能解封。
- 配置复杂：rDNS/PTR、SPF、DKIM、DMARC 都得配对，否则照样被拒（见 DNS 解析）。
怎么选 / 建议
- 选明确支持邮件、能开 25 端口、IP 干净的商家；1–2G 内存够。
- 新手慎入：送达率难保证。只是想收发邮件，用第三方邮件服务（域名邮箱）更省心。
- 自建适合折腾爱好者、强隐私需求者。
按上面的需求挑机？去 库存监控 按线路 / 地区筛选在售机型。
“Running your own mail server” sounds cool, but deliverability is the pitfall that discourages countless people. Understand what you’re getting into before you decide.
Three Major Challenges
- IP reputation: Many VPS IP addresses are on email blacklists — your outgoing mail goes straight to spam or gets rejected outright. You need a clean IP with no history of abuse (see native IP and IP reputation).
- Port 25 blocked: Many providers block the SMTP port 25 by default (to prevent spam). You must confirm you can get it unblocked before setting up a mail server.
- Complex configuration: rDNS/PTR, SPF, DKIM, and DMARC all need to be set up correctly — otherwise your mail still gets rejected (see DNS records).
How to Choose / Recommendations
- Pick a provider that explicitly supports mail servers, can open port 25, and has clean IPs; 1–2 GB of RAM is sufficient.
- Beginners should think twice: Deliverability is hard to guarantee. If you just need to send and receive email, a third-party email service (custom domain mailbox) is far less hassle.
- Self-hosting suits tinkerers and those with strong privacy requirements.
Looking for a VPS that meets these requirements? Go to the stock monitor and filter by network line / region.
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