CMass Guides
12 step-by-step tutorials covering every feature — from your first campaign to advanced follow-up sequences.
Paste emails directly into CMass
The fastest way to add recipients: paste a list of emails — one per line — with optional first name and last name.
Import a CSV file
Upload any CSV with an Email column. CMass reads first name, last name, company, and any custom columns automatically.
Connect Google Sheets
Link a Google Sheet directly — no download needed. CMass reads your columns live and maps them to merge tags.
Import from CMass Contacts
CMass builds a contact list from your Gmail history. Browse, search, and add contacts you've already emailed.
Personalize with merge tags
Use {first_name}, {company}, and any custom column from your sheet to make every email feel one-to-one.
AI personalization with Claude
Turn on AI personalization and Claude writes a unique, context-aware opening line for every contact — automatically.
Insert images and video thumbnails
Add hosted images or clickable YouTube/Vimeo thumbnails to your campaigns directly from the CMass editor.
Send a test email before launching
Preview how your email will look with real merge tag values — and send a test to yourself before going live.
Schedule campaigns and control send speed
Send now or at a specific time. Set a daily cap, pause between emails, and skip weekends to protect your sender score.
Ready to send your first campaign?
Free plan · No credit card · 50 emails/day
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