[neomutt-users] "3.16. attach_format"

[Rudolf Bahr]

Hello Neomuttists!

I'm new to this list, therefore I do not know what was already
written about. Is there an archive?

When inserting

set attach_format = “ %u%D%I %t%4n %T%.40d%> [%.7m/%.10M, %.6e%?C?, %C?, %s]  ”

as proposed in the NeoMutt Guide 3.16 into my .neomuttrc file NeoMutt 20170113 
gives me an error message "%u%D%I: Unbekannte Variable." meaning unknown variable.
Is something known about that?

Rudolf