请问HN：有没有Proton Mail的替代品？
我想要离开GMail，因为我不想依赖一个随时可能消失的服务。现在我需要离开Proton，因为他们无法保持法兰克福的空调正常运行。
人们正在尝试哪些替代方案？我希望有：
a. 一个可以连续运行一周而不会长时间宕机的服务。
b. 自定义域名。理想情况下，我希望所有发送到特定域名的邮件都能路由到我家里的服务器，并提供一个在线的网页邮件界面，能够查看最近几个月的邮件。
c. 不要在PGP或S/MIME上出错。
d. IMAP或POP。如果我不能简单地将邮件路由到我的本地服务器，我会选择IMAP（优先）和POP（如果必须的话）。
e. 一个可以连续运行一周而不会长时间宕机的服务。
我想我得到了我应得的。“ProtonMail”中的“S”代表“服务水平协议”。
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So I wanted to get away from GMail because I don't want to depend on a service that could just go away at any moment. Now I need to get away from Proton because they can't keep the air conditioners in Franfurt running.<p>What are the alternatives people are trying? I would like to have:<p>a. A service that can run for a week without going down for hours at a time.<p>b. Custom domains. Ideally I would like all messages to a particular domain routed to my in-home server with an online web-mail interface for the last couple of months.<p>c. Don't barf on PGP or S/MIME.<p>d. IMAP or POP. If I can't just get simple message routing to/from my local server, I'll take IMAP (preferably) and POP (if I have to.)<p>e. A service that can run for a week without going down for hours at a time.<p>I guess I get what I deserve. The "S" in "ProtonMail" is for "Service Level Agreement."