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Re:A serverless email server on AWS using S3 and SES by manigandham on Saturday January 04, 2020 @10:42AM (#21955426)
IaaS = your data + code to run it + create servers to run the code.

PaaS = your data + code to run it. Servers automatically provided.

SaaS = your data. Code and servers are automatically provided.

Serverless is just another name for PaaS where your bring your code, which can be deployed as a single JS function in a text file or an entire container running anything.

Re:A serverless email server on AWS using S3 and SES by grepfru_it on Saturday January 04, 2020 @11:13AM (#21955656)
PaaS is a collection of SaaS's. Your platform is made up of x,y,z services. Your services are made up of x,y,z infrastructure.