Microsoft Outlook 2007 (or later) with Symantec Endpoint Protection client and email tools.
When you send emails with attachments (regardless of size), the email fails to send and returns a popup error code 1003,8.
Symantec Email Proxy 1003,8
Your message to "<user>" "<email_address> with the subject of <email_subject>
Communication issues with the mail server. For example, this issue can happen if the mail hosting company changes authentication settings to prevent sending SMTP emails through a 3rd party provider.
- Change the email settings (SMTP server) to reflect any changes.
- Remove the email tools or improve the connectivity to the mail server.