Google Add-onPersonalized email merge engine operating directly from Google Sheets via native Gmail quotas. Zero external mail-relay servers, zero inbox snooping, and zero recurring subscriptions.
Coming to Google Workspace
Organizations and small businesses frequently need to dispatch personalized emails to client lists, event attendees, or team rosters. However, mainstream mail merge add-ons route your sensitive contact databases through external third-party mail servers, demand access to read your private inbox emails, and charge hefty recurring monthly subscriptions.
MailSync Shield executes your mail merges entirely within your Google account. Draft your message, insert dynamic token tags from your spreadsheet columns (like {{First Name}} and {{Organization}}), and MailSync Shield dispatches personalized emails directly via native Google Apps Script infrastructure.
Click to insert placeholders from any spreadsheet column into your subject line and HTML body for seamless individualization.
Emails dispatch directly from your active Google/Gmail session. Your contact data never touches external mail server intermediaries.
Records execution timestamps in a dedicated spreadsheet column, preventing duplicate sends and keeping a permanent local audit trail.
Never requests the restricted gmail.readonly scope. MailSync Shield cannot read your emails, scan your messages, or access incoming drafts.
MailSync Shield operates 100% inside your Google Workspace account. It respects native daily recipient quotas, transmits zero data to third-party databases, requires zero CASA Tier 2 lab fees, and comes with a transparent one-time lifetime license.