How do you unblock a sender from your e-mail?

Hello CherryJade22,

You can manage and remove email blocks by going to Settings > Mail > Threading > Blocked.

Please be sure to review all of the information in the "Manage your blocked phone numbers, contacts, and emails" part of the link you came from, which explains how to manage blocked emails, and may be helpful: Block phone numbers, contacts, and emails on your iPhone, iPad, or iPod touch

Manage your blocked phone numbers, contacts, and emails

To see the phone numbers, contacts, and email addresses that you've blocked from Phone, FaceTime, Messages, or Mail:

Phone

Go to Settings > Phone and tap Blocked Contacts to see the list.

FaceTime

Go to Settings > FaceTime. Under Calls, tap Blocked Contacts.

Messages

Go to Settings > Messages. Under SMS/MMS, tap Blocked Contacts.

Mail 

Go to Settings > Mail. Under Threading, tap Blocked.

Take care!