Hello Richard Leung,
The error seems to be related to your SMTP settings. Your SMTP server is not accessible - wrong IP address, username or password. Please verify that your settings are correct. For instance create a user control and send an email.
System.Net.Mail.MailMessage message =
"This is the message body"
// 25 is the default port
port = 25;
System.Net.Mail.SmtpClient smtp =
Check whether you have an dynamically generated dll under Sitefinity/ServiceAssemblies folder. This dll should be deleted when you switch your servers. On the next request to the Newsletters module the dll should be automatically generated again. If there is no dll or it cannot be generated, the request does not reach the web service or you are working in medium trust, while the generation could be done in full trust only
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