This is a known limitation in the SDR Agent's post-processing pipeline.
In Preview mode, the resolved prompt is sent directly to the LLM, allowing all instructions and content to render as expected.
However, when an email is generated through the UI, the SDR post-processing pipeline is invoked. This pipeline currently does not support custom instruction modifications in the same way as Preview mode resulting in custom formatting, signatures, dynamically generated text, or other content being truncated or excluded from the final email output.
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