The email is real, I received it from DeepSeek itself. I probably received it because I buy tokens directly from them.
No actual price increase however.
Also got the email. It warned of a future large price increase, and to carefully watch usage.
I read it as a "hey we will make stuff more expensive, don't miss it"
The banner on account settings; and a blurb on the pricing page:
"We plan to raise the overall pricing for DeepSeek API services in the near future, with a significant increase expected. Please plan your usage accordingly. The specific pricing plan will be subject to official notice."
Right below the pricing it is stated that they plan to increase the prices in the near future.
"near future" is not "today"
It can be because the message has been there for some weeks now.