Route Responsly survey emails through Mailgun for developer-friendly, reliable deliverability at any scale
Mailgun is the developer-focused email service that a lot of engineering-led teams pick for transactional and programmatic email needs. Responsly works with Mailgun cleanly — survey invitations and reminders get the same delivery reliability and domain reputation as the rest of your email.
For teams with existing Mailgun infrastructure, this integration keeps survey email inside a delivery stack you already understand, control, and monitor.
Where Mailgun and Responsly combine well
Transactional survey triggers
A survey triggered by a product event (signup, purchase, milestone) sends through the same Mailgun infrastructure as the corresponding confirmation. Timing, branding, and deliverability stay consistent — respondents see the message as part of the expected product communication flow.
Scheduled NPS or CSAT programs
Quarterly NPS sends to a customer base of 10K-100K users run cleanly through Mailgun’s batch send capabilities. Scheduling, rate limiting, and bounce handling all work at scale.
Developer-friendly automation
Mailgun’s API is easy to integrate from Node, Python, Go, or Ruby. Custom survey pipelines (Responsly → your own middleware → Mailgun) give full control over timing, targeting, and personalization for teams with engineering resources.
Reliable reminder sequences
A 3-day reminder to non-respondents typically doubles total response rate; a 7-day final reminder adds another 20-30%. Mailgun handles the send, tracks delivery, and surfaces failure modes before they damage the program.
Deliverability analytics
Mailgun’s reporting surfaces bounce rate, open rate, spam complaints, and delivery latency. Survey send health becomes visible alongside transactional send health in one dashboard.
Setting up Responsly with Mailgun
- Generate survey invitation links in Responsly. Unique per-recipient URLs with hidden fields.
- Design the Mailgun template. Personalized with survey link variable.
- Build the send automation. Pull recipients from Responsly, call Mailgun’s API with personalization data.
- Configure tracking. Enable Mailgun open and click tracking; feed data into your analytics for full-funnel visibility.
- Monitor and iterate. Watch bounce and response rates; adjust timing, subject lines, and targeting based on what the data shows.
Practices for clean survey email deliverability
Validate lists before sending. Mailgun’s email validation API reduces bounces and protects sender reputation.
Warm new sending subdomains. Dedicated subdomain for survey sends? Ramp volume gradually — jumping from 0 to 50K recipients in one send damages deliverability for weeks.
Respect timezone when sending. Morning sends in the recipient’s local time outperform single-time blasts dramatically.
Frequency-cap per recipient. Even legitimate survey programs hurt sender reputation if recipients feel spammed. Once per 30 days is a reasonable baseline.
Monitor complaint rate. Spam complaint rate above 0.1% warrants immediate investigation. Mailgun surfaces complaint data per campaign; use it to tune subject lines and audience selection.
Survey email as reliable as the rest of your stack
Connect Responsly to Mailgun and survey invitations become just another transactional send type — delivered reliably, tracked thoroughly, and managed alongside the rest of the organization’s email infrastructure. No separate vendor, no separate delivery concerns, no separate reputation to build. For best practices on email survey design that maximize response rates, see our email surveys guide and email survey tools guide. For embedding surveys directly in emails, see our email embedding guide.
