How to I set up an email alert for a candidate applying for a second and third job

How to I set up an email alert for a candidate applying for a second and third job

Hi

A lot of my candidates apply for more than one job to a particular client - currently they receive a welcome email from me when they register through Zoho Recruit.  Then they receive a further email telling them they have been registered against a particular job.  

When they apply for a second position they don't get the acknowledgement for that position which I want them to.

Please tell me how I do this.

Regards
Shirley