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An Rspamd multimap rule rejects attachments with extensions that are almost exclusively malware (Gmail's blocked list: executables, scripts, disk images, add-ins), including inside archives and double extensions, independently of ClamAV. settings.virusScanning turns ClamAV on for servers with enough RAM. Closes #20 Co-Authored-By: Claude Opus 5.5 <[email protected]> Claude-Session: https://claude.ai/code/session_01G22o7QQ17GRtkCqpJNFr9B
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Closes #20
Changes
blockedAttachmentExtensionsinsettings.nixholds Gmail's list of blocked file types (exe, scr, js, vbs, bat, msi, iso, img, dmg, lnk, jar, hta, ps1, xll, …). An Rspamdmultimaprule of typefilenamewithskip_archives = falserejects messages carrying them:invoice.pdf.exe.This works without ClamAV. The 550 message tells the sender to share a link instead.
Rspamd's built-in
MIME_BAD_EXTENSIONlist was deliberately not promoted to reject: it also contains.html/.htm, which some legitimate senders use. It still adds to the spam score as before.virusScanningsetting (defaultfalse) turns on ClamAV through the mail module, with guidance on RAM (4 GB+). The README limitation is updated.Testing
I ran Rspamd 4.0.1 locally with the generated config and real multipart messages:
setup.exeBLOCKED_ATTACHMENT[exe])report.pdfdocs.zipcontainingpayload.jsBLOCKED_ATTACHMENT[js])invoice.pdf.exeBLOCKED_ATTACHMENT[exe])All 5 provider example systems build. nixfmt, shellcheck and tofu validate pass.
🤖 Generated with Claude Code
https://claude.ai/code/session_01G22o7QQ17GRtkCqpJNFr9B
Generated by Claude Code