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