If you download a large attachment over a slow connection, mail performance is affected. The attachments are scanned when you open the attachment. If you use Microsoft Outlook over MAPI or Microsoft Exchange client and you have Auto-Protect enabled for email, attachments are immediately downloaded. Even if Internet Email Auto-Protect does not scan encrypted messages, it continues to protect computers from viruses and security risks in attachments. Auto-Protect detects the secure connections and does not scan the encrypted messages. You can enable Auto-Protect to support the handling of encrypted email over POP3 and SMTP connections. When Internet Email Auto-Protect is enabled, the client software scans both the body text of the email and any attachments that are included. Internet Email Auto-Protect protects both incoming email messages and outgoing email messages that use the POP3 or SMTP communications protocol over the Secure Sockets Layer (SSL). What version of SEP have you installed? Which components have been installed on the client machine?
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