それは良い期間でした。
今、彼らはこれまで利用していた無料プランがもう利用できなくなることを伝え、月額30ドルのスタータープラン、年額では360ドルへの移行を推奨しています。
(…) 旧無料プランは廃止されます。2019年9月15日までに、SparkPostアカウントにログインして現在のプランから選択する必要があります。送信パターンと機能の利用状況*に基づき、50Kスタータープランを推奨します。9月15日までに現在のプランのいずれかを選択しない場合、自動的に無料の「Test」プランに移行され、月間500通、1日あたり100通の制限がかかります。
*追伸: 私は週に6,000通未満のメールしか送信していません！
スタータープランは強制的な押し付けのように感じられます😲 SparkPostの機能は一切使っておらず、Discourseが登録メールや要約メールを送信するために必要なものだけを利用しています。Discourseのメール返信機能も使っていません。
では、他にどのようなメールサービスをお勧めできますか？
I used Mailgun, which has a great free tier. If you do less than 10,000 emails you should be fine and integration worked well with my Discourse install.
https://www.mailgun.com/pricing
I’m facing the same issue. The entry level Production tier cost is too high to justify staying.
Bear in mind though, you can share the quota across instances, so if you have several forums, all monetised …
Mass migration ensues! Lookout for related support posts 
(Trouble is, if they are an efficient outfit with most of their costs scaling with volume I suspect they won’t care - they just want to turn all volume into cash)
I was still on one of their old 100,000 free emails/month plan and got the mail too. I can’t blame them for having to run a profitable business, but for me, Amazon SES is a more economical choice. I’ve been using it on my Discourse instance for over a year without any issues.
How many emails are you sending?
Right now, about 200k a month, which costs me $20.
I figured people would want to use this post to compare alternatives to Sparkpost so I’ll mention that the only solution on the list of supported email services that’s able to compete with that is Elastic Email. It’s able to do 200,000 emails on $18 a month. I hope this is useful to users who want something with a premade config for Discourse but doesn’t cost a ton of money.
That’s still a tonne of money to small, low traffic sites and will push those sites into loss territory.
Small, low traffic sites aren’t likely to be sending 200,000 emails a month. Free tiers, either Elastic’s or Mailgun’s (which I recommended earlier) should suffice.
Excuse me @Owen_Walters, when you mentioned Elastic Email; which plan is the best to start with discourse? I saw in the pricing’s elastic email page that they offer… the “Email API”'s offer “Pay as you go” will work with discourse?
Pay as you go works with Discourse, yes.
That’s actually a very good option for even moderately active sites, and still good for very low volume new sites, thanks for sharing.
Do they aggregate by all your sites - ie charge by account rather than domain? Can you then leverage your quota across several sites? (Which would essentially make adding a new site marginally zero cost).
I’ve not personally used Elastic, but Mailgun/Sendgrid both have account based quotas.
I have tried them all until I settled with Amazon SES. 10/10 deliverability and for a small to medium site it will cost pennies.
Bad news. Elastic Email does not have Discourse’s integration. 
I contacted ElasticEmail’s Sales and Christine from Elastic Email said:
We do not have an integration with Discourse yet, You can try our integration with Piesync and it has a lot of apps supported.
So… goodbye Elastic Email too.
Ps; information updated about Elastic Email and Discourse, here #19.
SidV, what do you mean by that? SparkPost doesn’t specifically have Discourse Integration as such, but its SMTP interface permits Discourse to send emails? What is Elastic Email missing?
Hi Robert.
I really do not understand why Elastic Email Sales Support told me that. I asked them if they could buy any of their plans to use Discourse, and they responded again that there was no integration.
Now I’m still in conversation with another person.
Finally, Carlos from Elastic Email said:
Pay as you Go is definitely compatible with SMTP. You should have no problem using that plan. Just ensure to use the instructions in the article and the Discourse link you provided and everything should work correctly.
If there are any problems during setup please let us know and we’ll ensure to provide assistance to get everything working correctly. We highly appreciate your help with this.
Thanks for choosing Elastic Email!
I should try, but it seems that nobody here uses Elastic Email (?).
Just ask them if they still support SMTP, because that’s what Discourse uses. 
The guide I linked above shows how to use Elastic Email’s SMTP with Discourse.
I use SparkPost on one forum and MailGun on another. Wanted to hedge my bets and find the most cost-effective and reliable service.
SparkPost’s announcement just made that decision for me.
Just checked with Elastic Mail:
Given they are (very) slightly cheaper than Amazon SES if you are not using EC2, I think I will be going with Elastic Email’s Pay as You Go.