Send Certificates by Gmail in Bulk

Answer: Generate personalized PDF certificates locally in your browser, connect your Gmail account via OAuth, compose a message, and send hundreds of certificates as email attachments — all without a third-party email service or uploading participant data.

Built for hackathon organizers, workshop hosts, and educators who want delivery from their own inbox with full control and privacy.

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How do I send certificates by email using Gmail?

No SMTP configuration, no third-party mailer. MailMyCertificate uses official Google OAuth so emails come from your real Gmail address.

  1. 1

    Generate certificates locally

    Upload your template, import participant data, place fields, and generate all PDFs in your browser.

  2. 2

    Switch to the Email tab

    After generation, navigate to the Send step. Your certificates are ready to attach.

  3. 3

    Connect your Gmail account

    Click "Connect Gmail" and authorize via Google OAuth. No passwords are shared with MailMyCertificate.

  4. 4

    Compose your email

    Write a subject line and body message. Use merge fields to personalize each email.

  5. 5

    Send in bulk

    Click Send All. Certificates are delivered from your own Gmail account with PDF attachments. Track progress in real time.

How does Gmail OAuth work here?

When you click "Connect Gmail," you authorize directly with Google — not with MailMyCertificate. We receive a temporary access token stored in your browser session (never on our servers).

Emails are sent through the Gmail API from your own account. Recipients see your name and email as the sender. We never access your inbox, contacts, or other Gmail data.

MailMyCertificate requests only the gmail.send scope — the minimum permission needed to send emails. No read access.

MailMyCertificate vs other bulk email approaches

Comparison of certificate email delivery methods
ApproachSender identityData uploadCost
MailMyCertificate + Gmail Your Gmail addressNone — local browserFree
SaaS certificate platformsPlatform email or custom domainFull roster uploaded to vendorPer-certificate or subscription
Manual Gmail + attachments Your Gmail addressNone — but hours of manual laborFree (your time is not)

How many certificates can I send in one day?

Your ceiling is Gmail's own daily sending limit, not anything MailMyCertificate imposes. Because messages go through your account, Google's quota applies exactly as it would if you sent them by hand. A free personal Gmail account has a noticeably lower daily allowance than a paid Google Workspace account, so a large batch may need to be split across two days on a personal address.

Google publishes the current figures and adjusts them periodically, so check Google's sending limits documentation rather than trusting a number quoted on a third-party page. Two practical consequences worth planning around:

  • Hitting the limit is not data loss. Your generated PDFs remain in the browser session, so you can resume sending the remainder once the quota resets.
  • Attachment size counts. A heavy template image produces heavy PDFs. Keeping certificates to a couple of megabytes each makes delivery faster and reduces the chance of a bounce.
  • Send a test to yourself first. One message confirms the subject line, body text and attachment name render the way you expect before several hundred people receive them.
  • Download the ZIP if the roster is very large. Distributing through Discord, Slack or your LMS sidesteps email quotas entirely.

If a message fails, the failure is reported per recipient so you can retry only the affected rows rather than resending the whole batch. For the full walkthrough of the send step, see the step-by-step guide.

Gmail bulk certificate delivery FAQ

Sending, limits, and privacy

How many certificates can I send via Gmail at once?

We recommend batches of around 400 emails for reliability. Gmail API has daily sending limits (typically 500 for free accounts, 2000 for Workspace). MailMyCertificate respects these limits automatically.

Does MailMyCertificate store my Gmail credentials?

No. We use official Google OAuth — you authorize directly with Google. MailMyCertificate never sees or stores your password. Tokens remain in your browser session.

Can I customize the email subject and body?

Yes. The email composer lets you write a personalized subject and body. You can use merge fields like participant name in the message.

What happens if sending is interrupted?

MailMyCertificate tracks which emails have been sent. If you close the tab or lose connection, you can resume from where you left off when you return.

Is the certificate attached as PDF or inline?

Certificates are attached as PDF files to each email. Recipients see a personalized message with their certificate as a downloadable attachment.

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