send big attachment with outlook 2016 by activesync

How big attachment can z-push send I can’t send attachment over 50mb
the mail never leaves the outbox in outlook
and where can I change the Attachment Size Limit
on kopano server. I have set outlook it self to 100mb
MaximumAttachmentSize 102400kb in regedit
so the problem is outsite outlook
I use the Z-push Version 2.3.6


Hello @cbnidk ,

you are probably running into a limit set in your php configuration (or if of your proxy if you have set up a reverse proxy). for a start you could check your php.ini for memory_limit.