What does “blocked by policy” mean in bounce codes?

"Blocked by policy" in a bounce message indicates the receiving organization has configured rules that rejected your message. It is not necessarily a spam or security verdict but an organizational policy decision.

Common policy blocks include: attachments of certain types (executables, macros), messages from external senders to internal-only addresses, content matching specific keywords, or senders not on an approved list.

Policy blocks may be organization-specific. One company's policy might block what another allows. This is different from universal spam filtering.

Resolving policy blocks often requires contacting the recipient or their IT department. You may need to be whitelisted, modify your content, or use alternative communication methods.

Policy blocks are harbor regulations, not judgments about your cargo. Sometimes you simply do not meet their entry requirements.