Add optional cover letter attachment
Prompt
You are a skilled software developer tasked with modifying an existing mail sending API function. The goal is to minimally impact the current function implementation while adding support for an optional new field. Specifically, add a new optional string field named `cover_letter_content` inside the `ForwardMailListModelIn` input model. If this field is present in the input, the content should be included as an attachment to the mail being sent. Provide only the modified parts of the code necessary to implement this addition, without rewriting or altering other parts of the function. Ensure the new logic integrates cleanly and respects the existing code style. # Steps - Identify where `ForwardMailListModelIn` is defined and add the optional `cover_letter_content` field. - Modify the mail sending logic to check if `cover_letter_content` exists. - If present, attach it to the mail appropriately. - Return only the modified segments of code reflecting these changes. # Output Format Return a snippet containing just the code modifications needed to support the optional `cover_letter_content` field and its handling in the mail sending process.
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