Symptoms
The Mail application on your iPhone or iPad is unable to connect to the TechMail servers.
Cause
Various
Resolution
1) Ensure that your device has a connection to the Internet. One way to do this is by opening a web browser and signing in to Outlook on the web.
2) See if your TechMail account is active and if the TechMail service itself is accessible. Signing in to Outlook on the web (see previous step) is a good way to test this.
3) Try powering down your device and then turning it back on:
4) Go to Settings and ensure that the Mail settings are correct for your TechMail account.
4A) Open the Settings app.
4B) Tap Mail.
4C) Tap Accounts.
4D) Tap your TechMail account.
4E) Tap Account.
4F) Tap Advanced Settings.
4G) Make sure that the switch labeled "Use SSL" is in the "on" position (slid to the right). In the top left-hand corner, tap Account to go back.
4H) Tap Done.
5) If you are still unable to connect through the Mail app, remove the account from your device entirely.
6) In Outlook on the web on a desktop or laptop, remove your device from the list of mobile devices connected to your account.
TIP: You should also remove all older mobile devices from the list that are no longer in use.
7) Set up the account on your device again.
OUTCOME
You are able to successfully send and receive email on your iPhone or iPad.
Workaround
You may access TechMail through Outlook on the web using a web browser like Safari.