Azure Blob Storage

For distributed and larger-scale implementations, Stalwart Mail Server supports Azure Blob Storage as a backend for storing blobs (e-mail messages, Sieve scripts, etc.). Azure Blob Storage is a cloud-based object storage service that provides scalable storage for large amounts of unstructured data. By using Azure Blob Storage, Stalwart can store blobs on remote servers, facilitating large-scale storage management, easy data replication, and backup, making it a viable option for businesses seeking robustness and scalability.

Configuration

The Azure Blob Storage service is configured under the store.<name> section of the configuration file. The following attributes are supported:

• type: Specifies the type of storage, set to "azure" for Azure Blob Storage.
• storage-account: This option is used to specify the Azure Storage Account name where blobs (e-mail messages, Sieve scripts, etc.) will be stored.
• container: This option is used to specify the Azure Blob Storage container where blobs will be stored.
• azure-access-key: This option is used for authentication with the Azure Blob Storage service. The azure-access-key serves as a password for the Azure Storage Account.
• sas-token: This option is used for authentication with the Azure Blob Storage service. The sas-token is a shared access signature token that provides secure access to the Azure Storage Account.
• max-retries: This option specifies the maximum number of times the server will retry a failed operation before giving up.
• timeout: This option defines the maximum amount of time the server will wait for a response from the Azure service before it gives up.
• key-prefix: This option is used to specify a prefix that will be added to the keys of all objects stored in the Azure container. This can be useful for organizing and segregating data within the bucket.

Example

[store."azure"]
type = "azure"
storage-account = "stalwart"
container = "mail"
azure-access-key = "your-access-key"
timeout = "30s"
key-prefix = "stalwart/"