Previously I used to use webmail for email services.

1. I had created one mail welcome@domain.in with auto respond.

2. I had one form where in I used to take clients details. After submitting, this details used to be mailed via php as 

      TO:  welcome@domain.in        and FROM: clients@mail.in    (Kind of fake mail)

3: I used to get email from clients@mail.in at welcome@domain.in, and as it was on auto respond mode client used to get welcome message automatically.

But now as I shifted to zoho mails Iam not able to get mail with this same code.

Does zoho mails blocks such mails?