Attempting to send email from my new iPhone, it lands in the Outbox, with a message saying "The sender address was rejected by the server."
As far as I can tell, the account is set up correctly. I'm receiving email OK. The outbound server is SMTP.zoho.com
Edit: this is for two active email accounts. They work fine on my two Macs. Settings are the same on the iPhone. This is an iPhone 5, running iOS 6.1.4.
/Mr Lynn