id,summary,reporter,owner,description,type,status,component,version,severity,resolution,keywords,cc,stage,has_patch,needs_docs,needs_tests,needs_better_patch,easy,ui_ux 3985,send_mail user-defined headers,ido,Adrian Holovaty,"How do send_mail, send_mass_mail, etc. permit one to define custom headers (such as for S/MIME, List-Id, etc.) in the outgoing email message? This is a critical component of sending email that should not be overlooked in these docs.",,closed,Core (Mail),dev,,fixed,custom headers,,Accepted,1,0,0,1,0,0