Expand working-with-mime-messages with numerous new Aspose.Email samples

[agent-aspose-email-examples]

Automated submission from agentic runner.

Change summaries (LLM):
Added placeholder EML creation when input file missing using Aspose.Email.MailMessage.
Implemented HTML comment stripping with Regex on message.HtmlBody when IsBodyHtml is true.
Ensured output directory existence before saving.
Saved cleaned message via EmlSaveOptions (MailMessageSaveType.EmlFormat).
Wrapped all file I/O in try/catch and wrote error messages to Console.Error.
Safety: placeholder generation prevents file‑not‑found errors.

Added example loading MSG with Aspose.Email.MapiMessage.Load and scanning MapiAttachment list for image extensions.
Uses Path.GetExtension and case‑insensitive check to identify inline PNG/JPG/GIF/BMP attachments.
Removes identified attachments via message.Attachments.Remove to reduce storage before archiving.
Saves cleaned message with message.Save to a new .msg file.
Creates a placeholder MSG if input file is missing, ensuring the demo runs safely.
Wrapped in try/catch blocks with console error reporting for robust execution.

Added file‑system guard: checks input existence, creates placeholder MSG if missing.
Ensures output directory exists before saving.
Uses Aspose.Email MailMessage.Load to read MSG, iterates message.AlternateViews.
Collects and removes all LinkedResource objects from each AlternateView.
Saves modified message with SaveOptions.DefaultMsgUnicode to output path.
Wrapped all operations in try/catch with console error reporting for safety.

• Added guard for missing input file; creates a minimal placeholder EML with MailMessage.Save.
• Loads MIME message via MailMessage.Load and scans message.AlternateViews for empty streams.
• Collects and removes empty AlternateView instances to eliminate unnecessary multipart boundaries.
• Saves the cleaned message using MailMessage.Save to the specified output path.
• Wrapped operations in try/catch with console error reporting for safety.
• Intent: MIME cleanup / boundary reduction; no secrets included.

Added example demonstrating removal of read‑receipt header
Uses Aspose.Email.MailMessage and its Headers collection (Add, Remove)
Shows before/after values via Console output
Illustrates intent: prevent Disposition‑Notification‑To from being sent
Wrapped in try/catch for basic error handling (safety placeholder)
No external secrets or credentials included.

• Added example using Aspose.Email.MailMessage to load and modify an EML file.
• Demonstrates safe placeholder creation when input file is missing (MailMessage constructor + SaveOptions.DefaultEml).
• Removes the “Precedence” header via message.Headers.Remove("Precedence") to prevent bulk‑email handling.
• Saves the updated message to a new file with message.Save(outputPath).
• Wrapped all file and header operations in try/catch blocks for robust error reporting.
• Intent: MIME message manipulation – header removal; includes safety placeholders for missing input.

Added example for removing X‑Spam‑Status header before external send
Uses Aspose.Email: SmtpClient, MailMessage, Headers.Remove API
Demonstrates placeholder SMTP host detection to avoid real network calls
Wraps credential validation and header removal in try/catch for safety
Logs errors to Console.Error and skips send when placeholders present
Illustrates safe email composition and conditional sending flow

Added timestamp prefix to each saved attachment filename (DateTime.Now “yyyyMMddHHmmssfff”).
Utilizes Aspose.Email.MailMessage.Load and Attachment.Save for MIME extraction.
Creates a placeholder EML if the source file is absent to keep the flow safe.
Ensures output folder exists via Directory.CreateDirectory with error handling.
All file operations wrapped in try/catch, logging errors to Console.Error.
Category: Email MIME processing – attachment renaming and extraction.