I want to remove the ability to add attachments. Particularly, it should not be used for CiviMail as it's a great way to hurt email reputation and is simply unnecessary. I would rather load into my CMS media library and then add it into CiviMail via a hyperlink or image. I suppose I could argue that this option shouldn't even exist in CiviMail.
In Misc (Undelete, PDFs, Limits, Logging, Captcha, etc.) there are two options for attachments.
Maximum Attachments For Backend Processes
Does Maximum Attachments mean only for front end forms?
To prevent attachments from being used, I set both to 0. I also tried to set this with an override in civicrm.settings.php but it does not accept a 0, so I tried -1 and that 'save right' but still had no effect.
What are those settings effecting then if not CiviMail? How can I remove attachment functionality? My last resort is removing the option thru a tpl.extra. I would prefer not to do that and fix it at the source.