Product: MailOmatic for Schools
Description: This error occurs when sending emails from MailOmatic for Schools
This error is a generic error from your SMTP Server. Attempt to resend these excepted emails. If the problem persists, you will need to have your IT Mail Admin investigate the issue.
The following help forum/article is available via a search on Google: https://stackoverflow.com/questions/20228644/smtpexception-unable-to-read-data-from-the-transport-connection-net-io-connect
MailOmatic is not platform specific and the sending of emails is driven by the email server used by your organization. Please review the link provided above as it appears to contain some helpful information regarding a change to the port number in use that could resolve your issue.