At least one DNS server IP must be registered in the system in order to start the requested operation.
MailBee.NET (in MailBee.NET.dll) Version: 12.3.1 build 666 for .NET 4.5
public const int NoDnsServersAvailable
Public Const NoDnsServersAvailable As Integer
For instance, QuickSend(MailMessage)
method needs to perform MX queries to DNS servers.
If no DNS server is registered in the system, this method can't do its job. In this case, the developer can manually
specify DNS or SMTP server and use Send
method to send out mails.