I think GAE might be worth trying for your use case. It certainly should be cheaper than CM, and might be cheaper than SendGrid depending on how many recipients you e-mail.
Your volume of e-mails easily fits within GAE's limits. GAE allows e-mail to be sent to 2,000 recipients for free each day. Since you are willing to pay, you can send mail to up to 7,400,000 recipients per day. (Quota details)
If you go over the daily free quota of 2,000 recipients, you would have to pay $0.0001 per recipient.
This means you could e-mail about 860,000 recipients for $80/month (that works out to 28,666 per day [including 2,000 for free per day]). If you are e-mailing fewer people, then GAE may be cheaper than SendGrid. If you plan to e-mail more, then GAE will be more expensive.
Another advantage: with GAE, you may not have to worry as much about batching e-mails since GAE only charges per recipient.
Disadvantage of GAE: GAE also bills for other resources like CPU, bandwidth, etc. Depending on how you send e-mails and their content, you may or may not require more resources than GAE provides for free. You'll have to try it out to determine whether this will be an issue or not.
For the record, today (Jan 25, 2011) Amazon started to offer an email service (Amazon Simple Email Service http://aws.amazon.com/ses/). Email messages are charged at $0.10 per thousand.
a good option for you would be Elastic Email. (http://elasticemail.com) EE is very competitively priced with all the bells and whistles and is a "pay as you go" service.
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我认为对于您的用例来说，GAE 可能值得尝试。它当然应该比 CM 便宜，并且可能比 SendGrid 便宜，具体取决于您向多少个电子邮件收件人发送邮件。
您的电子邮件量很容易满足 GAE 的限制。 GAE 允许每天免费向 2,000 个收件人发送电子邮件。由于您愿意付费，因此您每天最多可以向 7,400,000 个收件人发送邮件。 （配额详细信息）
如果您超过了 2,000 个收件人的每日免费配额，您需要为每位收件人支付 0.0001 美元。
这意味着您可以每月支付 80 美元向大约 860,000 个收件人发送电子邮件（相当于每天 28,666 个收件人[包括每天免费的 2,000 个收件人]）。如果您向较少的人发送电子邮件，那么 GAE 可能比 SendGrid 便宜。如果您计划发送更多电子邮件，那么 GAE 会更贵。
另一个优点：使用 GAE，您可能不必担心批量电子邮件，因为 GAE 仅按每个收件人收费。
GAE 的缺点：GAE 还对其他资源（如 CPU、带宽等）进行计费。根据您发送电子邮件及其内容的方式，您可能需要也可能不需要比 GAE 免费提供的资源更多的资源。您必须尝试一下才能确定这是否会成为问题。
I think GAE might be worth trying for your use case. It certainly should be cheaper than CM, and might be cheaper than SendGrid depending on how many recipients you e-mail.
Your volume of e-mails easily fits within GAE's limits. GAE allows e-mail to be sent to 2,000 recipients for free each day. Since you are willing to pay, you can send mail to up to 7,400,000 recipients per day. (Quota details)
If you go over the daily free quota of 2,000 recipients, you would have to pay $0.0001 per recipient.
This means you could e-mail about 860,000 recipients for $80/month (that works out to 28,666 per day [including 2,000 for free per day]). If you are e-mailing fewer people, then GAE may be cheaper than SendGrid. If you plan to e-mail more, then GAE will be more expensive.
Another advantage: with GAE, you may not have to worry as much about batching e-mails since GAE only charges per recipient.
Disadvantage of GAE: GAE also bills for other resources like CPU, bandwidth, etc. Depending on how you send e-mails and their content, you may or may not require more resources than GAE provides for free. You'll have to try it out to determine whether this will be an issue or not.
郑重声明，今天（2011 年 1 月 25 日）Amazon 开始提供电子邮件服务 (Amazon Simple Email Service http:// /aws.amazon.com/ses/）。
电子邮件按每千人 0.10 美元收费。
For the record, today (Jan 25, 2011) Amazon started to offer an email service (Amazon Simple Email Service http://aws.amazon.com/ses/).
Email messages are charged at $0.10 per thousand.
Elastic Email 是一个不错的选择。 (http://elasticemail.com) EE 的价格非常具有竞争力，并且具有所有附加功能，并且是“按需付费”走”服务。
a good option for you would be Elastic Email. (http://elasticemail.com) EE is very competitively priced with all the bells and whistles and is a "pay as you go" service.
一个可能有效的解决方案是：
Dada Mail
您可以在 DadaMailProject.com 找到它，
他们刚刚发布了最新版本。
有一个免费版本（每封电子邮件底部都有 Dada 链接）。
有一个 50 美元/年的版本（一次付款、一年下载、终身使用软件）。
您可以获得便宜的主机（建议使用 BlueHost.com，但不隶属关系），并在那里安装 Dada Mail。
我的0.02！
=)
A solution that might work is:
Dada Mail
You can find it at DadaMailProject.com
They just released their latest version.
There is a free version (with Dada links at the bottom of each eMail).
There is a 50 $/year version (one payment, one year downloads, lifetime use of software).
You could get a cheap hosting (BlueHost.com suggested with not affiliation), and install Dada Mail there.
My 0.02!
=)