I can only receive but not send mails with my iPhone using IMAP, it works well on iPad and Mac.

I can only receive but not send mails with my iPhone using IMAP, it works well on iPad and Mac.

Hi there. 

I have been trying for more than 3 weeks to use my Zoho mail account on the iPhone but I can only receive mails, I need to use another app to send, it is very inconvenient, I already checked the soho website showing how to set up the IMAP on iPhone but still not working, I hope I can get some help here.

Cheers,
Miguel