Email Stops Working After Php Update

Hi All,

I want to use a script which requires php 5.6 and above so I updated my php to 5.6.14 but when i do that, All my emails Example. When a member registers at my website he receives a email validation email, All those emails doesn't go through that is the new member doesn't receives the validation email. But my web mail works fine.

All things work fine if i switch back to php 5.4.45.

I tried switching to other php versions too, but all has the same issue.

Can anyone help please.

you should check webserver and mail logs

Am sorry am a litttle noob in this, Ca you guide me exactly what and how to do please