making sure that it handles correctly very big emails.handling hierarchical messages (message with attached messages).making sure that malformed message will not result in buffer overun or other application crash.making sure that it parses correctly a MIME torture message from Mike Crispin (coauthor of Mime and IMAP RFCs).dealing with inline images and stylesheets embedded into HTML emails.dealing correctly with several methods of encoding attachments.dealing with S/MIME (encrypted and signed email messages).correcting malformed EML files caused by well known errors in popular mail clients and servers.I know, because I involved in developing one. Remaining 5% would take at least several months -). You can write an implementation working in 95% cases within few days.
Loading an EML file correctly is not as easy as it looks. Common sources of EML files include messages saved from Outlook Express or Thunderbird, messages downloaded from IMAP or POP3 servers. EML are in most cases MIME encoded files with mail messages.
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