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Google ACE Practice Question: A startup needs to send transactional emails…
A startup needs to send transactional emails (order confirmations, password resets) from their GCP-hosted application. Which GCP service handles high-volume email delivery?
⚠ Common exam trap
Google Cloud often tests the misconception that GCP provides a built-in email delivery service, leading candidates to choose Cloud Tasks or Pub/Sub, but these are generic messaging services that require integration with a dedicated email provider to actually send emails.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
A third-party email delivery service such as SendGrid or Mailgun, integrated via API
B is correct because GCP does not provide a native high-volume transactional email service. Third-party email delivery services like SendGrid or Mailgun are designed specifically for this purpose, offering dedicated SMTP relays, APIs, and reputation management to ensure reliable delivery of transactional emails such as order confirmations and password resets.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Cloud Tasks with an email delivery queue
Why it's wrong here
Cloud Tasks is a distributed task queue that schedules and dispatches HTTP target requests; it has no email server or message-formatting capabilities. You could enqueue an email-sending task that triggers a Cloud Function or App Engine endpoint to call a third-party email API, but Cloud Tasks alone cannot deliver the email, so the option misrepresents its role.
- ✓
A third-party email delivery service such as SendGrid or Mailgun, integrated via API
Why this is correct
Because GCP offers no built-in transactional email service, the standard pattern is to outsource sending to a dedicated email service provider such as SendGrid or Mailgun and call its REST API or SMTP relay from your GCP-hosted application. These providers handle deliverability, DKIM/SPF authentication, bounce processing, and provide analytics, which is exactly what production transactional email requires.
- ✗
Cloud Pub/Sub with an email topic subscriber
Why it's wrong here
Pub/Sub is a managed asynchronous messaging service that decouples publishers from subscribers; it does not include any email delivery or SMTP functionality. An email topic subscriber would still need to invoke a separate email API to actually send a message, making this a misdirected solution that adds a queueing layer but no native email capability.
- ✗
Cloud Functions triggered by Gmail API webhooks
Why it's wrong here
The Gmail API acts as a client-side interface to an individual user's Gmail mailbox, requiring OAuth scopes and user consent, and it enforces strict per-user quotas that make bulk transactional sending impractical. It is neither a webhook source for triggering Cloud Functions nor an approved channel for system-generated application emails, so this approach fails both on integration model and scale.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This ACE practice question is part of Courseiva's free Google Cloud certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the ACE exam.