MergelineDoes a mail merge tool store my contact list and email content on its servers?
Updated October 29, 2026
Many do. Mailmeteor keeps recipient addresses and merge fields for 180 days and event data for 90. GMass stores recipient addresses and passes email content through its server. YAMM’s policy says it uses Gmail message bodies and metadata. Streak says it does not store email bodies. Mergeline keeps lists, messages and results only in your browser.
What each tool says
| Tool | What it says it keeps |
|---|---|
| GMass | Recipient addresses for tracking and unsubscribes; content passes through its server; list info may be shared with ad platforms |
| Mailmeteor | Addresses and merge fields 180 days; open, click and reply events 90 days; templates and contacts with no set limit |
| YAMM | Uses message bodies, attachments, metadata, headers and settings |
| Streak | No email bodies; temporary metadata; data on Google Cloud in the US |
| Mergeline | Nothing on a server. Lists, emails and results stay in your browser |
From each vendor’s privacy or security page, checked October 29, 2026.
Why it matters
- Your list may include clients, students or donors who never agreed to a third party holding their details.
- Data kept on a server can be breached or shared.
- Some workplaces and schools forbid it outright.
The trade-off with local tools
Keeping everything in the browser means Mergeline cannot send from a server while your computer is off. Your browser needs to be open while a campaign runs, and it resumes if you close it. For many people that is a fair price for never handing over a list.
Read the privacy policy or the security page for detail.
Questions to ask any tool
- Does my list leave my browser or my Google account?
- How long do you keep addresses, merge fields and events?
- Can I delete my data, and how?
Check your own rules
Schools, clinics and many companies have rules about where personal data can go. Read them before you upload a list of students, patients or clients to any service.
Read the full guide: How to mail merge in Gmail
Related answers
Sources
Facts checked October 29, 2026. Google and other vendors change their limits and prices, so check the source before you rely on a number.
Mergeline does this from your own Gmail. Free for 60 emails a day with merge tags and no branding. Pro is $12 a month or $99 a year for follow-ups, scheduling and attachments.