A stylized, geometric design composed of three overlapping rectangular shapes in teal, blue, and purple, arranged diagonally against a white background. MailerSend
VS
SendPost

MailerSend vs SendPost: Scale Beyond Basic Transactional

MailerSend handles simple transactional emails. SendPost delivers enterprise-grade infrastructure with automated deliverability tools that scale to millions of emails.

Automated IP Warmup
Advanced Deliverability Alerts
High-Volume Infrastructure

Trusted by companies worldwide

Outgrowing MailerSend?

No Automated IP Warmup

MailerSend requires manual volume management. SendPost automates IP warmup with intelligent throttling based on ISP-specific limits as your volumes scale.

Limited Deliverability Visibility

Don't rely on basic dashboards. SendPost provides deep visibility with automated alerts for bounce spikes, SMTP errors, and ISP-level performance issues.

Not Built for Scale

MailerSend focuses on low-volume transactional emails. SendPost infrastructure handles millions of emails with intelligent routing, IP pool management, and enterprise-grade reliability.

Why developers choose SendPost

Superior Deliverability

Our entire platform, from our advanced infrastructure to our expert support, is built to ensure your emails reach the inbox, not the spam folder.

Actionable Insights, Not Just Data

Go beyond basic metrics. Get deep analytics, proactive alerts, and a full Deliverability CRM out of the box to quickly diagnose and fix issues.

Developer-First Experience

Clean APIs, extensive SDKs, and powerful webhooks supported by 24/7 expert assistance to help you build and scale faster.

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SendPost is a smarter choice for businesses that depend on email

Here's a summary and non-biased comparison between SendPost and MailerSend

Scroll to compare
Feature
A stylized, geometric design composed of three overlapping rectangular shapes in teal, blue, and purple, arranged diagonally against a white background.
Deliverability Alerts & Notifications
Excellent

Real-time automated alerts for bounce spikes, SMTP errors, reputation shifts, and ISP-level delivery issues. Proactive monitoring prevents problems before they impact performance.
Average

Basic analytics dashboard available. Users must manually monitor logs and metrics. No automated alerting system for deliverability issues.
IP / Domain Reputation & Monitoring
Excellent

Granular IP and domain monitoring with automated alerts when reputation issues arise. Continuous tracking across all major ISPs with actionable insights.
Average

Dedicated IPs available only on Enterprise plans. Basic reputation monitoring but limited automation in detecting and responding to issues.
IP Pool / Routing / Send Throttling / Warm-up
Excellent

Automated IP warmup with intelligent throttling based on ISP-specific limits. Dynamic IP pool management and routing optimize deliverability as volumes scale.
Weak

No automated IP warmup features. Users must manually manage sending volume increases. Basic routing available but requires manual configuration.
Analytics & Event Logging Granularity
Excellent

Deep filters on event logs with retention up to 3 years (longer by request). Detailed deliverability stats, ISP-level performance data, and comprehensive bounce intelligence.
Average

7-day log retention on free plan, 30 days on Professional plan. Basic analytics available but limited filtering capabilities and shorter retention periods.
Bulk Email & High-Volume Sending
Excellent

Built to handle millions of emails with intelligent throttling, IP pool management, and automated reputation protection at scale.
Weak

Designed for one-to-one transactional emails only. Bulk sending endpoint limited to 500 emails per request. Not optimized for high-volume operations.
Pricing Model
Strong

SendPost offers predictable pricing at scale with higher entry point but becomes most cost-effective solution at high volumes. No surprise charges.
Average

Volume-based pricing starts low but costs escalate quickly with overage charges. Account suspensions can result in lost prepaid funds according to user reviews.
Migration Tools / High-Volume Onboarding
Excellent

Purpose-built migration tools focus on preserving email deliverability and domain reputation during transitions. White-glove onboarding for high-volume senders.
Weak

No specialized migration tools. Standard onboarding process. Users report challenges with account approval and setup complexity.

Email API & SMTP Relay

Reliable infrastructure to send and manage millions of emails.

3 features
Scales from thousands to millions of emails
SDKs in 14+ programming languages
Personalization with custom fields & templating

Sub-Accounts & Groups

Organize and isolate email streams across teams or clients.

3 features
Unlimited sub-accounts
Group categorization for analytics
Reputation tracking per stream

Deliverability Stats

Track performance and troubleshoot issues with deep insights.

3 features
Bounce, open, and click rates
Metrics by account, sub-account, and IP
ISP and SMTP-level visibility

Deliverability Alerts & Notifications

Stay ahead of problems with real-time monitoring.

3 features
Alerts for blacklisting or score dips
Notifications via Slack or email
Detect ISP-specific deliverability issues

Pro Deliverability Tools

Optimize how emails are delivered.

3 features
Automated IP warmup
Throttle controls
Smart routing

Frequently asked questions

Everything you need to know about SendPost and transactional email delivery

Why choose SendPost over MailerSend?

MailerSend works well for basic transactional emails at low volumes. But when you need to scale to millions of emails, SendPost provides the automated deliverability tools, proactive monitoring, and enterprise infrastructure that MailerSend lacks. We automate IP warmup, provide real-time alerts, and handle high-volume sending that MailerSend simply cannot support.

Can SendPost handle both transactional and bulk email?

Yes! Unlike MailerSend's transactional-only focus (limited to 500 emails per bulk request), SendPost is built to handle both transactional messages and high-volume bulk sending with the same enterprise-grade infrastructure and deliverability tools.

Does SendPost offer automated IP warmup?

Absolutely. SendPost automatically manages IP warmup with intelligent throttling based on ISP-specific sending limits. MailerSend requires manual volume management, which can lead to deliverability issues if not done correctly.

How does SendPost pricing compare to MailerSend?

MailerSend may appear cheaper initially with their free tier and low entry pricing. However, costs escalate quickly with overage charges, and users report account suspensions with no refunds. SendPost has a higher entry point but becomes the most cost-effective solution at scale with predictable pricing and no surprise charges.

What deliverability tools does SendPost offer that MailerSend does not?

SendPost provides automated IP warmup, real-time deliverability alerts for bounce spikes and SMTP errors, granular IP and domain reputation monitoring, years of log retention with advanced filtering, and proactive recommendations. MailerSend offers basic dashboards but no automated alerting or advanced monitoring capabilities.

Is SendPost better for high-volume senders?

Definitely. MailerSend is designed for low-volume transactional emails and limits bulk sends to 500 emails per request. SendPost infrastructure handles millions of emails with dynamic IP pool management, intelligent routing, and automated reputation protection. If you're sending over 100k emails monthly, SendPost is the clear choice.

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