| Value |
Description |
| imapOptionNone |
No additional options are specified when establishing a
connection with the server. A standard, non-secure connection
will be used. |
| imapOptionIdentify |
This option specifies the client should identify itself
to the server. If enabled, the client will send the ID command
to the server as defined in RFC 2971. This option has no effect
if the server does not support the ID command. |
| &H400 |
imapOptionTunnel |
This option specifies that a tunneled TCP connection and/or
port-forwarding is being used to establish the connection to
the server. This changes the behavior of the client with
regards to internal checks of the destination IP address and
remote port number, default capability selection and how the
connection is established. |
| &H800 |
imapOptionTrustedSite |
This option specifies the server is trusted. The
server certificate will not be validated and the connection
will always be permitted. This option only affects connections
using the TLS protocol. |
| &H1000 |
imapOptionSecureExplicit |
This option specifies that a secure connection should be
established with the server and requires that the server
support the TLS protocol. This option initiates
the secure session using the STARTTLS command. |
| &H2000 |
imapOptionSecureImplicit |
This option specifies the client should attempt to
establish a secure connection with the server. The server must
support secure connections using the TLS
protocol, and the secure session must be negotiated immediately
after the connection has been established. |
| &H8000 |
imapOptionSecureFallback |
This option specifies the client should permit the use of
less secure cipher suites for compatibility with legacy servers.
If this option is specified, the client will allow connections
using TLS 1.0 and cipher suites that use RC4, MD5 and SHA1. |
| &H40000 |
imapOptionPreferIPv6 |
This option specifies the client should prefer the use of
IPv6 if the server hostname can be resolved to both an IPv6 and
IPv4 address. This option is ignored if the local system does
not have IPv6 enabled, or when the hostname can only be resolved
to an IPv4 address. If the server hostname can only be resolved
to an IPv6 address, the client will attempt to establish a
connection using IPv6 regardless if this option has been
specified. |