A problem with increase size of attachment in config

[kea]

Hello!
I'm trying to increase size of attachment. Now it 20Mb.  I've add in config
postfix
@mail:~# postconf -n message_size_limit
message_size_limit = 50240000
RC conf at bottom line
$config['max_message_size']='50M';

But still get 20Mb limit when attach file

[JohnDoh]

Check `upload_max_filesize` and `post_max_size` in your PHP config

[kea]

Check `upload_max_filesize` and `post_max_size` in your PHP config

Thanks for advice , it was in one of php.ini's