What Spark Mail's terms say
Spark Mail's terms of service and privacy policy have 12 rated points: 0 serious, 3 bad, 8 worth knowing and 1 good. 4 apply whenever you use the site, signed in or not; 8 only once you have an account.
Whenever you use Spark Mail
Bad 1
The service is only available in some countries approved by its government
Where it says this ↗
Worth knowing 3
This service is only available for use individually and non-commercially
This service is only available for use individually and non-commercially.
Where it says this ↗The service is provided 'as is' and to be used at your sole risk
The service is provided 'as is' and to be used at the users' sole risk
Where it says this ↗There is a date of the last update of the agreements
Where it says this ↗
If you have a Spark Mail account
Bad 2
Your account can be deleted or permanently suspended without prior notice and without a reason
Your account can be deleted without prior notice and without a reason
Where it says this ↗Tracking pixels are used in service-to-user communication
Where it says this ↗
Worth knowing 5
You must create an account to use this service
Where it says this ↗You are prohibited from sending chain letters, junk mail, spam or any unsolicited messages
Where it says this ↗You must report to the service any unauthorized use of your account or any breach of security
Where it says this ↗You are responsible for maintaining the security of your account and for the activities on your account
Where it says this ↗Your private content may be accessed by people working for the service
Where it says this ↗
Good 1
You can opt out of receiving promotional communications
You can opt out of promotional communications
Where it says this ↗
The documents
Ratings by ToS;DR volunteers; they can lag behind the current terms. Not legal advice.