Download AttachZIP to restrict attachment size for each user. It allows you to specify maximum attachment size for specified IBM DD groups.
i.e. AttachZIP - restrict attachment size
Maximum attachment size: 10240 KB for default users
20000 KB for IBM DD group 2: AttachZIP HR users
30000 KB for IBM DD group 2: AttachZIP Accounting users
40000 KB for IBM DD group 3: AttachZIP IT users
http://www.notesmail.com/AttachZIP
Otherwise, you can globally restrict message size for Notes users, and globally restrict messages size and attachment size for iNotes users as seen below.
IBM Notes: Restricting message size
1. Open DD Server configuration settings document - Router/SMTP tab - Restrictions and Controls tab - Restrictions tab, then change field: Maximum message size
IBM iNotes: Restricting message size and attachment size
1. Open DD Server configuration settings document, then click IBM iNotes tab and change field: Maximum attachment size (kb)
2. Open DD Internet Sites (Web Site) document, then click Domino Web Engine tab and change field: Maximum POST data (in kilobytes):
3. Open DD Server document, then click Internet Protocols tab - HTTP tab and change HTTP Protocol Limits field: Maximum size of request content
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