Emailing Activities with attachments from SAP

Our customer is on 88 PL 18 using MS Outlook 2010. They are using Outlook integration.

They send out Activities from SAP throughout the day. A few of the sales members notice when they have several attachments included in the Activities and sent it as an email from SAP they get an error of B02069, Failed to send E-mail via Microsoft Outlook. The latest example was 4 attachments in a Activity. It is not a size limit issue as the 4 attachments only totaled 2 mg yet the error noted above popped up.

Is there a limit on the number of attachments in Activities. Could this be an issue with the B1_shr folder?

Tried this and no go, outlook-message-sending