New mail sent failed from your iPhone, iPad mail app. Reviews all the possible reasons behind failure or cannot sent. On third party custom domain email setup with mail app some time create critical issues, So you don’t sent mail to any third party recipients. Learn most probable causes for Cannot send Mail from iPhone.
If you not receiving incoming mail to your mail address then you must verify all the detailed used for incoming server configuration. And for Sent mail, you need to verify outgoing mail server configurations.
Troubleshooting steps on cannot send mail from iPhone, iPad: iOS 9, iOS 8
For the re-verification your entered detail you need SMTP details for incoming server or our going server. Username and password for our mail account, Port number use for mail.
Enter correct mail details under Mail setting app
Username and password must be same as you use on webmail. (Without misspelled)
Incoming or outgoing SMTP mail address depends on your Mail hosting Provider Company (iPage, Siteground, Bluehost, Hostgator, Godaddy, Fatcow, eHost, SiteBuilder and many others). Default format should be mail.yourdomain.com, smtp.yourdomain.com – for incoming/ outgoing mail respectively.
Incoming Mail server: Remove Host Name, User Name (Email Address) and Password. re-enter updated details.
Outgoing Mail Server: Primary Server, Enter only Host Name.
Test from your iPhone from sent sample mail.
Remove or Delete Mail account, Setup again
Delete account from your iPhone, Not erase all mail data stored on Mail server but only remove login details and server address.
Check your Wi-Fi or internet data
Interruption in your Wireless network connection might be the possible reason for Cannot send Mail from iPhone mail app. Test connection on internet speed checker app.
Make sure about you haven’t change or update your webmail password. That point you need to update old password with new one.
Above are the possible reasons to fix Cannot send Mail from iPhone running on iOS 9 later or iOS 8, iOS 7. Any suggestions about that you have, and then share with us on comment box.