Email marketing is one of the highest-ROI digital marketing channels — consistently delivering returns that outperform social media, paid ads, and other owned channels. MigoSMTP gives you the infrastructure to send marketing emails reliably, at scale, with full visibility into who received, opened, and clicked your campaigns. This article introduces email marketing concepts and explains how MigoSMTP supports each one.
Marketing Email vs Transactional Email
|
Marketing Email |
Transactional Email |
| Purpose |
Promote products, build relationships, drive conversions |
Confirm an action the recipient took — order, payment, password reset |
| Triggered by |
Your campaign schedule or a marketing automation event |
A specific user action on your product |
| Consent required |
Yes — explicit opt-in required in most jurisdictions |
Implied by the transaction; opt-in not required for the triggered message |
| Examples |
Newsletter, product announcement, promotional offer, re-engagement campaign |
Order confirmation, shipping update, invoice, OTP, password reset |
| Best practice sender |
Use a different subdomain from transactional (e.g. newsletter@ vs mail@) to isolate reputation |
Dedicated transactional subdomain protects transactional deliverability |
Separate your streams: Use a different verified domain or subdomain in MigoSMTP for marketing email versus transactional email. If your marketing reputation suffers (due to unsubscribes or spam complaints), it will not drag down the deliverability of your critical transactional emails.
Types of Marketing Email
| Type |
Description |
Frequency |
| Newsletter |
Regular updates about your business, industry news, content, or products sent to subscribers |
Weekly, fortnightly, or monthly |
| Promotional campaign |
Time-limited offer, discount, sale announcement, or product launch |
Event-driven |
| Welcome series |
Automated sequence of emails triggered when a new subscriber joins — introduces your brand, builds trust |
Automated sequence over days/weeks |
| Re-engagement campaign |
Targeting inactive subscribers to win back their interest before removing them from your list |
Quarterly or as needed |
| Abandoned cart email |
Triggered when an e-commerce visitor adds items to cart but does not complete checkout |
Automated trigger |
| Post-purchase follow-up |
Sent after a customer completes a purchase — requesting a review, upselling, or thanking |
Automated trigger |
How MigoSMTP Supports Email Marketing
| Need |
MigoSMTP Feature |
| Send bulk marketing emails reliably |
High-volume SMTP relay and REST API with daily/hourly throttling for inbox-friendly delivery |
| Know who opened your campaigns |
Open tracking with pixel — see opens per message, by recipient, in real time |
| Track link clicks |
Click tracking — every link in your email is wrapped; clicks are logged with timestamp and IP |
| Manage unsubscribes automatically |
Suppression list — unsubscribers are added automatically and never receive future emails |
| Understand your sender reputation |
Reputation score (0–100) updated in real time based on delivery, bounce, and complaint rates |
| Personalise emails per recipient |
Template variables with merge tags — inject recipient name, order details, or any custom field |
| Respond to delivery events in your app |
Webhooks — real-time callbacks for delivered, opened, clicked, bounced, and complained events |
Email Marketing Best Practices — Quick Reference
- Build your list organically — never purchase email lists. Purchased lists have high bounce rates and spam complaints that will permanently damage your sender reputation.
- Use double opt-in — send a confirmation email after sign-up. Only add subscribers who click the confirmation link. This produces a higher-quality, more engaged list.
- Keep your list clean — remove hard bounces immediately. Remove unengaged subscribers (no opens in 90 days) quarterly using a re-engagement campaign first.
- Authenticate your sending domain — SPF, DKIM, and DMARC are non-negotiable for marketing email. Unauthenticated emails go to spam.
- Provide a clear unsubscribe option — every marketing email must include a visible, one-click unsubscribe link. This is legally required in most jurisdictions.
- Send at consistent times — recipients who know when to expect your emails are more likely to open them. Consistent sending patterns also improve IP reputation.
- Monitor your metrics — a healthy marketing email program has a delivery rate above 95%, an open rate above 20%, a bounce rate below 2%, and a spam complaint rate below 0.1%.
Key Metrics to Monitor
| Metric |
Formula |
Healthy Benchmark |
| Delivery Rate |
(Delivered ÷ Sent) × 100 |
> 95% |
| Open Rate |
(Unique Opens ÷ Delivered) × 100 |
> 20% (varies by industry) |
| Click-to-Open Rate (CTOR) |
(Unique Clicks ÷ Unique Opens) × 100 |
> 10% |
| Bounce Rate |
(Bounces ÷ Sent) × 100 |
< 2% |
| Spam Complaint Rate |
(Complaints ÷ Delivered) × 100 |
< 0.1% |
| Unsubscribe Rate |
(Unsubscribes ÷ Delivered) × 100 |
< 0.5% per campaign |
Next Steps