Tag Contacts when importing a CSV

I see CSV as the only Upload format, does this mean that the format should exactly be the same as the Downloaded CSV for a list?

Maintaining a good list hygiene

Suppression list

Do I have to manually check for duplicate subscribers within my lists?

Importing Contacts from an Excel

How to launch an SMS Campaign

Magento version 1 Integration

FTP Integration

What is the preferred date data type to sync to a VBOUT form?

Email Marketing Benchmarks and Statistics

Contact Tags

Most common reasons for an email to end up in spam

How to avoid your emails ending up in spam

Avoid these email spam words

Adding Contacts to your account

Creating a Landing Page