Session ID separator change

[Marc Schiffbauer]

* Stephan Bosch schrieb am 06.04.16 um 02:03 Uhr:
> Op 4/6/2016 om 12:14 AM schreef Marc Schiffbauer:
> > * Timo Sirainen schrieb am 05.04.16 um 19:29 Uhr:
> > […]
> >> So now I'm mainly wondering if ':' is a good character? Has somebody
> >> already changed mail_log_prefix in a way that these additional ':'
> >> chars might break their log parsers (e.g.
> >> mail_log_prefix=%u:%s%{session}:%r).
> > Why not use another '+'?
> >
> 
> That '+' in the example is just part of the Base64 encoding, so it is
> not a separator.

Sure, but as long as you never want to decode this again it would be ok.  
By not introducing a new char you have a higher chance of not breaking 
existing setups.

Or do we *want* a separator that is visible as such?


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