Hi again.
I looked over at Tesco's website but it wasn't very helpful. They only list that you should use smtp.tesco.net as the server. That's not helpful because you also need to know the server port, verification method, etc
http://www.tescobroadband.com/help-and-support/articles/view/2118?cat=1160
However, I found this discussion thread from 2010 that includes a mail from Tesco support at the bottom. You can try to use that to set up your email:
Can receive Emails but won't send - Tesco Mobile Uk
I will paste it here as well:
hank you for e-mailing support@tescomobile.com
I am sorry to read of the issues you are experiencing with your Tesco Mobile iPhone and the settings. I can appreciate how frustrating this must be for you.
Following on from Mark’s e-mail regarding the settings for the GPRS and MMS, you will need to set up the e-mail account via our network, with the correct SMTP settings.
Please can you remove whatever e-mail account is already showing under the account section and switch your iPhone off and on. Once you have done this, please can you follow the below processes to try and set up the e-mail account via Tesco Mobile.
Settings
Mail, Contacts, Calendars
Account
Select the account type from the list displayed or the other option
Select ‘Add Mail Account’
Enter the name
Enter the e-mail address and password
Click save
If the account verification fails:
Tap ‘Your Name’ and enter your full name
Tap ‘Address’ and enter full e-mail address
Tap ‘Description’ and enter the description (This is what you wish the account to be called)
Tap either ‘POP’ or ‘IMAP’ on the top bar (Depends on what e-mail provider you are using)
Enter the ‘Host Name’ (You can check this here: http://www.o2.co.uk/ISPsettings)
Enter the username and password for the e-mail account
Enter the smtp host name Smtp.o2.co.uk
Leave the username and password blank
Tap the ‘Save’ option which can be found at the top left hand side of the screen
If a message appears on the screen saying ‘Unable to connect to server using SSL, do you wish to connect to server without SSL, select ‘Yes’)
When this completes tap ‘smtp.o2.co.uk’
If the server setting shows as ‘Off’ then tap it once to switch it to ‘On’
Tap the ‘SMTP’ button in the top left hand corner
Tap the name of your old SMTP setting
If the server settings shows as on then tap it once to switch it to ‘Off’
Once these processes have been followed, your e-mail account to Virgin should be set up correctly. We do support Virgin through the e-mail and so you should not be experiencing any issues.
If it still fails I recommend you print out this page and call Tesco and ask them to help you fill this form in. Yeah, this is a pain for you, but should still solve your issue.
Mail settings you might need from your email provider - Apple Support