Bastion Mail Server Sdk

VB.NET

' Who may sign in.
Dim users = New InMemoryUserAuthenticator()
users.AddUser("alice@example.com", "correct horse battery staple")

' A certificate. This one is made once and reused.
Dim certificate = CertificateFactory.LoadOrCreateSelfSigned("server.pfx", "a password", "mail.example.com")

Dim options = New ImapServerOptions() With {
    .ServerName = "mail.example.com",
    .Certificate = certificate,
    .Authenticator = users,
    .MailStore = New DirectoryImapMailStore("C:\Mail")}

options.Endpoints.Add(New ServerEndpoint(IPAddress.Any, 143, ServerEndpointSecurity.StartTls))
options.Endpoints.Add(New ServerEndpoint(IPAddress.Any, 993, ServerEndpointSecurity.ImplicitTls))

Dim server = New ImapServer(options)
server.Start()

C#

// Who may sign in.
var users = new InMemoryUserAuthenticator();
users.AddUser("alice@example.com", "correct horse battery staple");

// A certificate. This one is made once and reused.
var certificate = CertificateFactory.LoadOrCreateSelfSigned("server.pfx", "a password", "mail.example.com");

var options = new ImapServerOptions {
    ServerName = "mail.example.com",
    Certificate = certificate,
    Authenticator = users,
    MailStore = new DirectoryImapMailStore(@"C:\Mail")
};

options.Endpoints.Add(new ServerEndpoint(IPAddress.Any, 143, ServerEndpointSecurity.StartTls));
options.Endpoints.Add(new ServerEndpoint(IPAddress.Any, 993, ServerEndpointSecurity.ImplicitTls));

var server = new ImapServer(options);
server.Start();

46 deliberate faults survived

Torn connections, half-written files and killed processes, injected on purpose by a chaos suite you can run yourself.

700 sessions at once

All three servers in one process. Fifty back-to-back rounds of the whole programme — 58,150 test runs — with threads flat at about 130 and not one message unaccounted for.

Thirty-six sample servers

One per protocol, per language, per runtime, in solutions for Visual Studio 2019, 2022 and 2026. Plus a test host, a load harness and the chaos suite.