It’s a protocol limit: https://www.rfc-editor.org/rfc/rfc5322#section-2.1.1
— Andrew Sullivan Please excuse my clumbsy thums > On Aug 6, 2022, at 13:44, post...@ptld.com wrote: > > Does postfix through either smtp or submission (or both) force line breaks? > I am noticing line breaks after every 998 characters in the body of plain > text messages. > > If postfix is the one doing this, is it hard coded or is it a variable that > can be changed?