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How to update SMTP (Outgoing Server) settings on iPhone / iPad
If you need to update your Outgoing Server (SMTP) settings at any point after you have set up your email account on your iPhone, this is how you access the Outgoing Server settings, and these are the settings you need to set them to, for your hosted email account to work (for LINUX hosted clients).
To get to these settings, click on SETTINGS on your iPhone.
You will see the SETTINGS SCREEN. Scroll down toMAIL > CONTACTS > CALENDARS, and click on that: