MergelineCan Gmail mail merge send to duplicate email addresses?
Updated October 29, 2026
Usually not. Gmail’s mail merge will not send twice to the same address, and most tools, Mergeline included, remove duplicates on import. That is a problem when one parent has two children in your class. The fix is to merge those rows into one before sending, with a column that lists both children, so the parent gets one email that covers both.
Why tools remove duplicates
Most of the time a duplicate is a mistake, and two copies of the same email look like spam. So tools play it safe. A teacher on Reddit hit the other side of it: “Mail merge wont let me send to duplicate emails”, because siblings shared a parent’s address.
Combine the rows
| ParentName | Children | |
|---|---|---|
| jane@example.com | Jane | Sam and Alex |
| john@example.com | John | Riley |
Then write: “Hi {{ParentName|there}}, here is this week’s update for {{Children}}.” In Sheets, a pivot table or the TEXTJOIN function can group children by email for you.
When each child needs a separate note
If grades or reports differ per child, either put both notes in one email with clear headings, or create personalized drafts and send the second one by hand. Mergeline Pro’s drafts mode writes one draft per row for you to review, which suits a class list.
More on emailing families in the teachers guide.
Other duplicate cases
- A contact listed twice with an old and a new name. Keep the newest row.
- Two people sharing a team inbox, like office@example.com. Write one email that greets them both.
- The same person in two lists you combined. Mergeline removes the second copy on import and tells you how many it removed.
Look at the import summary each time; a high duplicate count usually means two lists were joined without cleaning.
Keep a family sheet
If you email families often, keep one sheet with one row per household, listing all children in one column. Every update then goes out once per family, with no clean-up needed each time.
Read the full guide: Mail merge for teachers
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.