How to stop automatic sending of phishing emails from web application?

Question

I have some web applications,hosted in different domains.

But users are reporting that they are getting phishing emails from those. What may be the reason behind that and most importantly,how would I stop these?

Can HTTPS/SSL help me out? Plz help.

N.B. : I'm using PHP,MySQL here.

Thanks in advance

Answer 1

They basically don't receive emails for exactly those domains. A phishing email can be send from any domain with any email address you want.

It's also good to check your servers for malicious scripts that are inserted there without your knowledge.