This property defines if wodSmtpServer will require SSL
encryption to be used by clients when they try to deliver
the message. You should set it to one of constants defined
in SecurityEnum.
It defaults to SecurityNone since most mail
servers don't support SSL encryption.
When set to SecurityAllowed, then server will accept
STARTTLS command, but will not require it for posting a
message.
If SecurityRequired is chosen, server will not allow
message to be sent unless client sent STARTTLS command.
If SecurityImplicit is chosen, server will negotiate SSL
connection even before any (SMTP specific) data is sent
through the socket. Usually, server should be running on
port 465 when this type is selected.
When you set Security property, make sure Certificate
is set also.