Hi all, when mailman is configured to add header/footer to messages or if it scrubbs attachments, as a side effect it changes Content-Transfer-Encoding of the messages from 8-bit to e.g. base64. However, without any header/footer the messages are passed exactly as received, unmodified.
This is highly undesirable in some cases. For instance, mailinglist might be used to distribute trouble tickets or other content which is expected to be easily parsable by automated text-based utilities. At the same time, with base64, emails grow in size by 33 % and such emails are getting much higher spam scores since base64 is typically used by spammers to obfuscate the payload. The attached patches try to fix the behaviour by preserving original Content-Transfer-Encoding even when adding header/footer or scrubbing. I believe adding of footer should be as non-intrusive as possible, so keeping the original Content-Transfer-Encoding is as important as keeping e.g. format=flowed which is being done already. Please find the patches attached/scrubbed. Let me know your opinion about this. Thanks, Petr
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