Two important functions have been added to 1and1Mail v3.9:
1. Automatically remove bounced and unsubscribed emails from your mailing list:
2. Support content spin and make every of your emails look different:
Other enhancements include:
1. Support HTML and plain text edit in Email Template
2. Fine-tune the text field length
3. Prompt notification when the username is different from email address when setting up SMTP server
4. Support single quote in contact information