[Users] Failed to execute default Mail Reader under Xfce4

[mahlamytsike at gmail.com]

Hi !

Under my Xfce4 i experience "Failed to execute default Mail Reader"
"Input/uotput error." when trying to open mailto: links from Palemoon
or Firefox. Opening web links with Palemoon in Claws Mail works well.

Under "exo-preferred-applications -c" default mail application is set
to Claws Mail.

In same time /usr/share/xfce4/helpers/sylpheed-claws.desktop shows
up 

X-XFCE-CommandsWithParameter=/usr/lib/xfce4/exo-1/exo-compose-mail-1
sylpheed %B "mailto:%s";

which i changed to 

X-XFCE-CommandsWithParameter=/usr/lib/xfce4/exo-1/exo-compose-mail-1
claws-mail %B "mailto:%s";

with no effect.

Does anyone have experiences with similar problem ?

Thank you !