Matt Corallo:
>
>
> On 9/16/21 12:15, Wietse Venema wrote:
> > Matt Corallo:
> >> Can you describe in more detail what line_length_limit does? I
> >
> > You are confusing two different parameters
> >
> > - smtp_line_length_limit. This applies to SMTP.
> >
> > - line_length_limit. Does not apply to SMTP.
> >
> > Postfix will happily deliver mail with headers of up to 102400
> > bytes, except in the case of SMTP.
> >
> > Wietse
> >
>
>
> Yes, I buy that I'm conflating things, but my point is more than
> line_length_limit isn't fully documented and I'm confused as to
> what it refers to/where in postfix it is applied.
It is not relevant to the problem at hand, which is broken DKIM
signatures.
But if you must insist on getting sidetracked, when Postfix receives
a long line in an email message, Postfix stores that line in pieces.
And when Postfix delivers mail (including to a milter) it glues the
pieces together again. It like a program that copies a large file:
it reads and writes limited-size pieces instead of reading the whole
file into memory before writing it out. In case you never heard of
the concept, this is called buffering.
Wietse
