//
// Zusammenfassung:
// No authentication. Sometimes used with MailBee.SmtpMail.Smtp when the server
// allows relay for anonymous senders.
None = 0,
//
// Zusammenfassung:
// Standard authentication. Passwords are transmitted as clear-text. Not supported
// by SMTP servers.
Regular = 1,
//
// Zusammenfassung:
// Secure APOP authentication. Supported by many POP3 servers but cannot be used
// with other servers like SMTP because APOP is POP3-specific. Disabled when MailBee.Global.FipsMode
// is enabled.
Apop = 2,
//
// Zusammenfassung:
// A custom SASL authentication method implemented by the developer.
SaslUserDefined = 4,
//
// Zusammenfassung:
// SASL LOGIN authentication. Not secure but widely supported. Passwords are transmitted
// as Base64 strings. Note for IMAP users: this is AUTHENTICATE LOGIN command, not
// just LOGIN command (which corresponds to MailBee.AuthenticationMethods.Regular
// method).
SaslLogin = 8,
//
// Zusammenfassung:
// SASL PLAIN authentication. Not secure but widely supported. Passwords are transmitted
// as Base64 strings.
SaslPlain = 0x10,
//
// Zusammenfassung:
// Secure SASL CRAM-MD5 authentication. Might not be supported by particular server
// implementations. Disabled when MailBee.Global.FipsMode is enabled.
SaslCramMD5 = 0x20,
//
// Zusammenfassung:
// Secure SASL DIGEST-MD5 authentication. Might not be supported by particular server
// implementations. Disabled when MailBee.Global.FipsMode is enabled.
SaslDigestMD5 = 0x40,
//
// Zusammenfassung:
// Secure SASL NTLM authentication (also known as Secure Password Authentication
// - SPA). In Windows domain environment such as Active Directory, can also be used
// to authenticate the current Windows user (in this case, the developer should
// pass a null reference (Nothing in Visual Basic) as accountName and password values).
// Might not be supported by particular server implementations. May not work in
// UWP apps, consider GSSAPI instead. See remarks section for futher details regarding
// Integrated Windows Authentication.
SaslNtlm = 0x80,
//
// Zusammenfassung:
// Secure SASL MSN authentication (equivalent to NTLM). Not widely supported nowadays.
SaslMsn = 0x100,
//
// Zusammenfassung:
// Secure SASL GSSAPI authentication (through Kerberos or NTLM). Like MailBee.AuthenticationMethods.SaslNtlm,
// supports Integrated Windows Authentication mode. The internal implementation
// (Kerberos or NTLM) is selected upon whether targetName of Login method is an
// empty string or not (for SMTP case, MailBee.SmtpMail.SmtpServer.TargetName).
// Empty string denotes NTLM, all other values (including a null reference) denote
// Kerberos. Also, the underlying implementation downgrades to NTLM from Kerberos
// if targetName is not empty but not valid (denotes non-existent SPN).
SaslGssApi = 0x200,
//
// Zusammenfassung:
// OAuth v1.0 authentication (widely used by Google in the past). It's a password-only
// authentication. To create a key to be supplied as the OAuth password, use MailBee.OAuth
// class. As the OAuth account name, specify a null reference (Nothing in Visual
// Basic). Note that if you supplied both the password and the account name when
// logging in, MailBee will exclude OAuth from the set of authentication methods
// to be tried unless MailBee.AuthenticationMethods.SaslOAuth is the only method
// listed in this set. This is because OAuth is not compatible with other authentication
// methods which require a login and a password, not a "key". You can, however,
// specify non-null account name if you explicitly specified MailBee.AuthenticationMethods.SaslOAuth
// method to be used for login. This account name can be any string, it won't be
// used during the login process itself (because it uses only the password) but
// it will be displayed in the log file in place of the account name.
SaslOAuth = 0x400,
//
// Zusammenfassung:
// OAuth v2.0 authentication. A newer and recommended version of OAuth. All MailBee-specific
// details (listed above in MailBee.AuthenticationMethods.SaslOAuth description)
// are valid for this method as well.
SaslOAuth2 = 0x800,
//
// Zusammenfassung:
// Tells MailBee to automatically select the best supported authentication method
// and downgrade to insecure methods if secure methods are not supported by the
// server. This behavior can be changed with MailBee.AuthenticationOptions flags.
Auto = 0xFFF
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