On 18 Jun 2020, at 05:38, Dominic Raferd <domi...@timedicer.co.uk> wrote: > I understand the reason for smtp_line_length_limit and for its default > value of 998, which is of course good. > > But it is an occasional problem for me that this wrapping action is > only applied at smtp stage and not earlier; in particular it is after > any (open)dkim milter adds its key, because smtp's wrapping means that > the key then becomes invalid.
No, wrapping header lines does not affect DKIM if it is configured properly. The correct setting is c=relaxed which means that white space changes in headers are ignored. Setting it to simple instead will result in breaking because it makes DKIM reject RFC complain folding of long headers. I don't even know why that setting exists, honestly. (Your own message to the list used c=relaxed)\, which makes me think that perhaps your DKIM breaking is caused by something other than folding the header line?) > But postfix's sendmail does not honour the RFC or the > smtp_line_length_limit value and happily submits emails with overlong > lines, I believe the is because that is how sendmail works? > and this is where my problem occasionally arises, say when > emailing output from a cron job. There is no reason to use sendmail to do that, especially if it causes a problem. -- Slab: Jus' say 'AarrghaarrghpleeassennononoUGH'. --Feet of Clay
