Yes.
You can import existing contact lists and organize them within your account. The quickest way is uploading a CSV file, but you can also add contacts one by one or connect via API.
To import a CSV file:
1. Go to Contacts, then All contacts and click Add contacts
2. Select Upload a file and choose your CSV
3. Map each column to the correct Flexmail field
4. Confirm you have the right to email these contacts
5. Click Import
Validating your sender address
1. Go to Settings, then Add or remove senders
2. Click Add a new sender and enter the email address
3. Flexmail sends a confirmation email to that address — the owner of that inbox needs to open it and click Verify my email address
4. Once verified, you're ready to send from that address
Setting up email authentication
After validating your sender address, set up email authentication. This tells receiving mail servers like Gmail and Outlook that your emails are legitimate — helping them land in the inbox rather than the spam folder.