Error after sending an email

[SIZE=14px] Hello, inside the event OnAfterInsert, I’m sending an Email without attachment. Data saves correctly and mail is sending ok, but I got this error :

is_writable(): open_basedir restriction in effect. File(/var/tmp/) is not within the allowed path(s): (.:/web/vhosts/mar278/www:/web/vhosts/mar278/privado:/web/tmp)

In development enviroment is working fine but in production not. The configuration tmp is this:
/web/vhosts/mar278/www/CRM/tmp

I dont have access to PHP.ini in the server to modify open_basedir

Can you help me. Regards. Guillermo.

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See here: http://php.net/manual/en/ini.core.php#ini.open-basedir

It is a setting in your server.