WP Mail SMTP
Widely used SMTP plugin from the WPForms team: 15 mailers free, with logs, alerts, backup connections and smart routing in Pro.
96
Post SMTP
SMTP and API mailer plugin with free email logs, fallback SMTP, failure alerts and a mobile app; Pro adds Microsoft 365, SES and tracking.
Free installs300K+WordPress.org, active
Est. Pro installs~15KLikely 7.5K–30K
Vendor claims400K+Vendor's own figure
Rating4.7/5528 reviews
Price from$59.99/yrFreemium
Last updated24 Sep 2026Version 4.0.2
Overview
Post SMTP began as a fork of the abandoned Postman SMTP plugin and is now developed by WPExperts. It sends WordPress email through SMTP or a provider’s API and puts a lot of monitoring into the free version, including an email log, a fallback server and failure notifications.
How it works
A three-step wizard has you pick a mailer, enter credentials and send a test email. The free plugin includes Gmail via the Gmail API (using your own Google Cloud OAuth client) and API sockets for SendGrid, Mailgun, Brevo, Postmark, SparkPost, Mailjet, Elastic Email, SMTP2GO, Resend, MailerSend, SMTP.com and others, plus a generic SMTP option. A fallback SMTP server can be configured for when the main connection fails, and a run-mode setting can log emails without delivering them.
Free vs Pro
Free users get detailed logs with resend, deliverability checks (SPF, DKIM, DMARC and spam score), a weekly summary email, and failure alerts by admin email, Slack, Pushover, the Chrome extension or the Post SMTP mobile app. Pro is sold as Basic ($59.99), Professional ($79.99) and Business ($99.99) per year. Basic adds the Pro mailers (Microsoft 365, Amazon SES, Zoho) and one-click Gmail; Professional adds automatic retries, bulk resend, batching and quota scheduling; Business adds Microsoft one-click setup, Teams alerts, mobile-app Pro features and expert setup. The report and tracking extension adds open tracking and health reports.
Strengths and limitations
- The most capable free logging and alerting among freemium SMTP plugins.
- A mobile app and Chrome extension for failure notifications are unusual in this category.
- Tracking covers opens only, with no click tracking, and there is no rule-based routing.
- The pricing page does not spell out which plan includes every extension, and Microsoft 365 needs a paid plan.
- The admin interface mixes older Postman screens with newer ones, so it is less tidy than some rivals.
Who should pick it: sites that want logs, fallback sending and phone or browser alerts without paying, and agencies that would use the app or MainWP extension to watch email across many sites.
Best for: Sites that want free email logging, fallback SMTP and phone or browser failure alerts, with optional paid retries and Microsoft 365.
Post SMTP gives away more monitoring than most freemium rivals, and the mobile app is a genuinely useful extra. Its Pro tiers are reasonably priced but loosely documented, and Microsoft 365 users must pay, so it suits sites that value free logs and alerts over a polished interface.
Pros
- Email log with resend, fallback SMTP and failure alerts in the free version
- Free Gmail API connection plus many API sockets (SendGrid, Mailgun, Brevo, Postmark)
- Mobile app and Chrome extension for instant failure notifications
- Built-in SPF, DKIM and DMARC checks and an email tester
- Pro automatic retries, quotas and batching for high-volume sites
Cons
- Microsoft 365, Amazon SES and Zoho require a paid plan
- Open tracking only, with no click tracking, and no rule-based routing
- Pricing page does not map every Pro extension to a plan
- Interface is less polished than WP Mail SMTP or FluentSMTP
Key features
What Post SMTP highlights on its WordPress.org page and its own website, split by version.
Free version WordPress.org
- Three-step setup wizard with test email
- Gmail API with your own OAuth app
- API sockets for SendGrid, Mailgun, Brevo
- Detailed email log with resend
- Fallback SMTP when sending fails
- Alerts by email, Slack and Pushover
- Chrome extension notifications
- Mobile app failure alerts
- SPF, DKIM and DMARC checks
- Weekly email summary
- Log-only mode for testing
- Multisite with global settings
Pro / paid adds From $59.99/yr
- Microsoft 365 / Office 365 mailer
- Amazon SES and Zoho Mail mailers
- Gmail and Microsoft one-click setup
- Email open tracking and graphs
- Daily, weekly or monthly health reports
- Automatic retry of failed emails
- Bulk resend from the log
- Quota and batch scheduling
- Log retention by days
- Attachment storage in logs
- Twilio SMS and Teams alerts
- Multi-site monitoring in the mobile app
- Expert setup on Business
Feature checklist
20 of 23 features we track in SMTP & Email Delivery, feature score 90/100
Sending & mailers 7/8
Any SMTP server Key
Send through any SMTP host with your own credentials.
Other SMTP option connects to any SMTP server.
Included
API mailer integrations Key
Native API connections to SendGrid, Mailgun, Brevo, Postmark and similar.
Core plugin includes API sockets for SendGrid, Mailgun, Brevo, Postmark, SparkPost, Mailjet and more.
Included
Gmail & Google Workspace Key
Sign in with Google (OAuth) instead of storing a password.
Gmail API with your own OAuth client is free; one-click Gmail setup needs Pro.
Included
Microsoft 365 / Outlook
Send through Outlook or Microsoft 365 with OAuth.
Office 365 connection needs Pro; Microsoft one-click setup is in Business.
Paid version Basic
Amazon SES
Native Amazon SES integration.
Amazon SES is a Pro mailer, included from the Basic plan.
Paid version Basic
Backup connection Key
Falls back to a second mailer if the main one fails.
Fallback SMTP takes over when the primary fails; Pro adds more connections.
Included
Smart routing
Send different emails through different connections by rules.
No rule-based routing; extra connections act only as fallbacks.
Not included
Setup wizard
Guided setup with a test email at the end.
Three-step wizard: choose mailer, configure, send test email.
Included
Logs & monitoring 7/7
Email log Key
Keeps a record of every email sent from the site.
Detailed log with status, errors, filters and print option in the free plugin.
Included
Resend from the log
Resend failed or individual emails from the log.
Resend individual emails from the log; bulk resend needs Professional.
Included
Open & click tracking
See whether emails were opened and links clicked.
Report and tracking extension tracks opens only, not clicks; plan not specified.
Paid version Basic
Failure alerts Key
Alerts by email, Slack, SMS or push when sending fails.
Free alerts by email, Slack, Pushover, Chrome extension or app; Twilio and Teams are Pro.
Included
Automatic retry & queue
Queues emails and retries failed sends automatically.
Auto-retry a set number of times, with batching and quota scheduling.
Paid version Professional
Delivery reports
Charts or weekly summaries of sent and failed emails.
Free weekly summary of totals and failures; Pro adds health reports and graphs.
Included
Log retention & attachments
Control how long logs are kept, with optional attachment storage.
Free caps the number of stored log entries; day-based retention and attachments need Pro.
Partial
Email control 3/4
Force from name & address
Override the sender name and address on every email.
Settings prevent plugins from changing the From email and From name.
Included
Turn WordPress emails on or off
Disable individual core, update or WooCommerce notification emails.
No option to disable individual WordPress notification emails.
Not included
Stop sending / test mode
Block outgoing email on staging sites or while testing.
Run mode can log emails only, or ignore them, instead of delivering.
Included
Test email & diagnostics
Send a test email and see a readable error if it fails.
Send Test Email tool plus an email tester with spam score checks.
Included
Security & admin 3/4
Secure credential storage
Store keys in wp-config constants or encrypted in the database.
Authentication credentials, including fallback SMTP, can be set as wp-config constants.
Included
Multisite support
Network-wide or per-site settings on multisite.
Multisite supported with global network settings in the free plugin.
Included
No paywalled mailers
All supported mailers are available in the free version.
Microsoft 365, Amazon SES and Zoho mailers are Pro-only.
Not included
Developer hooks & WP-CLI
Hooks, filters or WP-CLI commands for developers.
Documented action and filter hooks; constants for logging and auth.
Included
Pricing
Free
$0On WordPress.org
Free
Freeper yearUnlimited
WordPress.org version with logs, fallback SMTP and alerts.
Basic
$59.99per year1 site
All Pro mailers (Microsoft 365, Amazon SES, Zoho), Gmail one-click, standard support. Selector offers up to 1,000 sites at other prices.
Professional
$79.99per year1 site
Adds auto-resend of failed emails, bulk resend, quota/batch scheduling and priority support.
Business
$99.99per year1 site
Adds Microsoft one-click setup, Teams alerts, mobile-app Pro features and expert setup. Lifetime plans also offered (prices not shown).
Prices are list prices from the vendor's site, checked 14 Oct 2026. Many vendors discount the first year.
How many sites use Post SMTP?
Free installs from WordPress.org, the vendor's own claim, and our estimate of paid installs.
Free version (WordPress.org)
300K+
Active installations reported by WordPress.org.
Vendor claim
400K+
Sites/users claimed on the vendor's website. source
Estimated Pro / paid installs
~15K
Our estimate, see method below.
How we estimated this: WordPress.org shows 300K+ free installs, which could mean anything from 300K to 400K. The vendor says 400K+ sites, so we put the free count halfway between the middle of that range and the vendor figure, at about 380K. About 380K free installs x 4% (the usual share of free sites that also run the paid version when most features are free) gives 15K. Likely range: 7.5K to 30K. This counts sites running the paid version, including sites whose licence has lapsed. Estimates are rough and based on public figures as of 14 Oct 2026.
Stats & health
Weekly downloads
19,475 downloads last week, 20.5M all time
Rating breakdown
| Version | 4.0.2 |
|---|---|
| Last updated | 24 Sep 2026 (39 days ago) |
| Tested up to | WordPress 7.1.4 |
| Requires | WordPress 5.6.0+, PHP 7.1+ |
| Support threads (2 months) | 9 of 16 resolved |
| On WordPress.org since | 15 Oct 2017 |
Company & policy
| Refund policy | 14-day money-back (source, 11 Oct 2026) |
|---|
Post SMTP compared
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FluentSMTP
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FAQ
Is Post SMTP free?
Yes. Post SMTP has a free version on WordPress.org. Paid plans start at $59.99/yr.
How many sites use Post SMTP?
WordPress.org reports 300K+ active installations of the free version. The vendor claims 400K+ sites in total. We estimate around 15K sites run the paid version.
Does Post SMTP have any smtp server?
Yes: included. Other SMTP option connects to any SMTP server.
Does Post SMTP have api mailer integrations?
Yes: included. Core plugin includes API sockets for SendGrid, Mailgun, Brevo, Postmark, SparkPost, Mailjet and more.
Does Post SMTP have gmail & google workspace?
Yes: included. Gmail API with your own OAuth client is free; one-click Gmail setup needs Pro.
Does Post SMTP have backup connection?
Yes: included. Fallback SMTP takes over when the primary fails; Pro adds more connections.
Does Post SMTP have email log?
Yes: included. Detailed log with status, errors, filters and print option in the free plugin.
Does Post SMTP have failure alerts?
Yes: included. Free alerts by email, Slack, Pushover, Chrome extension or app; Twilio and Teams are Pro.
What does Post SMTP Pro add over the free plugin?
Pro unlocks the Microsoft 365, Amazon SES and Zoho mailers, one-click Gmail setup, open tracking and health reports, automatic retries, bulk resend, quotas and batching, Twilio and Teams alerts, and Pro mobile-app features, depending on the plan.
How much is Post SMTP Pro?
Annual plans are listed at $59.99 (Basic), $79.99 (Professional) and $99.99 (Business), with a selector for more sites and lifetime options. There is a 14-day money-back guarantee.
Can I use Gmail for free with Post SMTP?
Yes, by creating your own Google Cloud project and OAuth client for the Gmail API. The one-click Gmail setup that skips this step requires a Pro licence.
Does Post SMTP have a backup mailer?
Yes. A fallback SMTP connection is available, and Pro adds additional connections so failed emails move to the next mailer.
Last updated 11 Oct 2026. Spotted something wrong? Suggest an edit.