Azure Blob Storage

For distributed and larger-scale deployments, Stalwart supports Azure Blob Storage as a blob store. Azure Blob Storage is a cloud-based object storage service designed for scalable storage of unstructured data, and is well suited to large-scale storage management, replication, and backup of email bodies, Sieve scripts, and other blobs.

Configuration

The Azure backend is selected by choosing the Azure variant on the BlobStore object (found in the WebUI under Settings › Storage › Blob Store). The variant exposes the following fields:

• storageAccount: the Azure Storage Account used to hold blobs (required).
• container: the container within the Storage Account where blobs are stored (required).
• accessKey: the access key for the Storage Account (required). The secret may be supplied inline, read from an environment variable, or loaded from a file.
• sasToken: shared access signature token, used instead of an access key for SAS-based authentication.
• timeout: maximum time to wait for a response from the Azure service. Default: "30s".
• maxRetries: maximum number of retries for a failed operation. Default: 3.
• keyPrefix: optional prefix prepended to every object key, useful for organising or segregating data within a container.