请问HN：有没有推荐的电子邮件营销工具，支持A/B测试和自动化序列功能？
我一直在使用Sendgrid的免费套餐，但他们已经取消了这个服务，现在我正在寻找更好的替代方案。Mailchimp似乎太贵了。
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I've been using Sendgrid's free tier, but they've cancelled it and now I'm trying to figure out if there is a better alternative. Mailchimp seems too expensive.