No activation mail

-- url of the page with the problem -- : www.soultantra.nl
-- HikaShop version -- : 2.4.0
-- Joomla version -- : 3.4.1
-- PHP version -- : 5.5.9
-- Browser(s) name and version -- : any browser

Hello,

two days ago we moved the site from php 5.3.10 to php 5.5.9 and now new customers don't receive the activation mail anymore.

Any suggestions?

Kind regards,
Raoul

Hi,

I don't see why updating the PHP version of your web server would change anything.
I suppose that the php.ini must have changed and you lost the configuration of your email server in it.
Either that, or you need to reconfigure the email settings of the Joomla configuration.