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FluentSMTP vs SureMail

Updated 11 Oct 2026. 23 features compared side by side.

FluentSMTP

★★★★★★★★★★ 4.8 (412)

Completely free, open-source SMTP plugin from WPManageNinja with native API mailers, email logs, resend, fallback and chat-app alerts.

Free installs700K+
FromFree
UpdatedSep 2026
Visit site Full profile
VS

SureMail

★★★★★★★★★★ 4.7 (25)

Free SMTP and email log plugin from Brainstorm Force with 15+ mailers, backup connections, auto-retry, resend and email simulation.

Free installs200K+
FromFree
UpdatedOct 2026
Visit site Full profile

Choose FluentSMTP if…

  • You need Microsoft 365 / Outlook
  • You want the more complete feature set (89/100 vs 81/100)
  • You prefer the more widely used option

Choose SureMail if…

  • You need automatic retry & queue

FluentSMTP includes 1 feature that SureMail lacks, including Microsoft 365 / Outlook; SureMail has 1 that FluentSMTP lacks, including Automatic retry & queue. Both include 18 of the 23 features we track. 1 feature is not yet verified for one or both plugins.

At a glance

FluentSMTP
SureMail
89/100
Feature score
81/100
20 of 23
Features included
19 of 23
4.8/5
WordPress.org rating
4.7/5
700K+
Active installs
200K+
95%
Support threads resolved
50%

Feature comparison

Click a screenshot to see both plugins side by side.

Feature
FluentSMTP
SureMail
Sending & mailers8/87/8
Any SMTP server KeySend through any SMTP host with your own credentials.
FluentSMTP Included

Generic SMTP driver for any host, such as Yahoo, Outlook.com or cPanel mail.

SureMail Included

'Other SMTP' connection takes any host, port, SSL/TLS and optional login.

API mailer integrations KeyNative API connections to SendGrid, Mailgun, Brevo, Postmark and similar.
FluentSMTP Included

API drivers for SES, SendGrid, Mailgun, Brevo, Postmark, SparkPost, SMTP2GO and more.

SureMail Included

API connections for SendGrid, Mailgun, Postmark, Brevo, SparkPost, Mailjet, MailerSend, SMTP2GO and more.

Gmail & Google Workspace KeySign in with Google (OAuth) instead of storing a password.
FluentSMTP Included

Gmail and Google Workspace connect through OAuth.

SureMail Included

Google Workspace / Gmail connection authorises with Google OAuth using your Cloud client ID and secret.

Microsoft 365 / OutlookSend through Outlook or Microsoft 365 with OAuth.
FluentSMTP Included

Outlook/Office 365/Microsoft 365 connection via OAuth API, free.

SureMail Not included

No Microsoft 365 or Outlook OAuth connection among the listed providers; generic SMTP only.

Amazon SESNative Amazon SES integration.
FluentSMTP Included

Native Amazon SES API driver included free.

SureMail Included

Dedicated Amazon SES connection.

Backup connection KeyFalls back to a second mailer if the main one fails.
FluentSMTP Included

Fallback connection is used when the default connection fails.

SureMail Included

Connections for the same From email are tried in sequence until one succeeds.

Smart routingSend different emails through different connections by rules.
FluentSMTP Partial

Routes each email to the connection matching its From address; no subject or plugin rules.

SureMail Partial

Emails go to the connection matching their From address; no other routing rules.

Setup wizardGuided setup with a test email at the end.
FluentSMTP Included

Setup assistant to configure a connection and send a test email.

SureMail Included

Onboarding wizard (v1.7+) sets up the first connection; the SureContact path ends with a test step.

Logs & monitoring5/76/7
Email log KeyKeeps a record of every email sent from the site.
FluentSMTP Included

Logs every email with headers, body and server response in its own table.

SureMail Included

Logs every email with status, body, headers, attachments and server response.

Resend from the logResend failed or individual emails from the log.
FluentSMTP Included

Resend any logged email singly or in bulk, failed or sent.

SureMail Included

Resend one email or bulk-resend selected emails from the log.

Open & click trackingSee whether emails were opened and links clicked.
FluentSMTP Not included

No open or click tracking is offered.

SureMail Not included

Logs show delivery status only; no open or click tracking is offered.

Failure alerts KeyAlerts by email, Slack, SMS or push when sending fails.
FluentSMTP Included

Instant failure alerts to Slack, Telegram, Discord or Pushover.

SureMail Via add-on

Needs the separate OttoKit plugin (free plan available) using the 'Email Failed to Send' trigger.

Automatic retry & queueQueues emails and retries failed sends automatically.
FluentSMTP Not included

No automatic retry queue; failed emails are resent manually or handled by the fallback.

SureMail Included

Failed emails are retried automatically across all connections after 30 minutes.

Delivery reportsCharts or weekly summaries of sent and failed emails.
FluentSMTP Included

Dashboard sending charts plus a scheduled email summary of sent and failed totals.

SureMail Included

Dashboard charts of sent and failed emails plus an optional weekly email summary.

Log retention & attachmentsControl how long logs are kept, with optional attachment storage.
FluentSMTP Included

Delete Logs setting keeps logs from 7 days up to 2 years.

SureMail Included

Choose when logs are auto-deleted; optional attachment storage.

Email control3/43/4
Force from name & addressOverride the sender name and address on every email.
FluentSMTP Included

Per-connection Force From Email and Force Sender Name options.

SureMail Included

Per-connection Force From Email and Force From Name toggles override other plugins.

Turn WordPress emails on or offDisable individual core, update or WooCommerce notification emails.
FluentSMTP Not included

No settings to disable individual WordPress or WooCommerce notification emails.

SureMail Not included

No settings to switch off individual WordPress or WooCommerce notification emails.

Stop sending / test modeBlock outgoing email on staging sites or while testing.
FluentSMTP Included

Email Simulation logs emails without sending; also a constant to force it.

SureMail Included

Email Simulation logs outgoing emails without delivering them.

Test email & diagnosticsSend a test email and see a readable error if it fails.
FluentSMTP Included

Send plain or HTML test emails from settings or WP-CLI.

SureMail Included

Send Test Mail from the Connections tab; failures show the provider's response in the log.

Security & admin4/43/4
Secure credential storageStore keys in wp-config constants or encrypted in the database.
FluentSMTP Included

Keys encrypted with WordPress salts, or stored as wp-config constants.

SureMail Partial

Connection credentials are encrypted in the database; no wp-config.php constants.

Multisite supportNetwork-wide or per-site settings on multisite.
FluentSMTP Partial

Works on multisite but is configured per subsite, with no network-wide settings.

SureMail Not verified

Multisite support is not documented.

No paywalled mailersAll supported mailers are available in the free version.
FluentSMTP Included

Every mailer and feature is in the free plugin; no Pro version exists.

SureMail Included

No paid version; every mailer is in the free plugin.

Developer hooks & WP-CLIHooks, filters or WP-CLI commands for developers.
FluentSMTP Included

WP-CLI commands for test, health, stats and prune-logs, plus constants.

SureMail Included

Filters such as suremails_before_send_email and suremails_provider_list, plus Abilities API; no WP-CLI.

Statuses: Yes Pro Add-on Partial 3rd-party No ?

Pricing compared

FluentSMTP Free

Free$0
FreeFree lifetime, Unlimited

SureMail Free

Free$0
FreeFree per year, Unlimited

Downloads trend

FluentSMTP

42,032 downloads last week

SureMail

16,238 downloads last week

Verdict

Based on our feature data Checked 11 Oct 2026

FluentSMTP scores higher on our feature checklist (89/100 against 81/100) and includes Microsoft 365 / Outlook that SureMail does not. SureMail still has the edge on automatic retry & queue. Check the features you rely on in the table below before deciding.

Biggest differences

Microsoft 365 / Outlook

FluentSMTP: included. SureMail: not included. Outlook/Office 365/Microsoft 365 connection via OAuth API, free.

Automatic retry & queue

FluentSMTP: not included. SureMail: included. Failed emails are retried automatically across all connections after 30 minutes.

Written from the feature, pricing and install data on this page, not from hands-on testing. How we compare.

Which would you choose?

0 votes so far. Vote to see the results.

FAQ

Which is better, FluentSMTP or SureMail?

FluentSMTP scores higher on our feature checklist (89/100 against 81/100) and includes Microsoft 365 / Outlook that SureMail does not. SureMail still has the edge on automatic retry & queue. Check the features you rely on in the table below before deciding.

Which has more features?

FluentSMTP includes 20 of the 23 features we track, against 19 for SureMail. Feature count is only part of the picture; check which of the differences matter to you.

Is FluentSMTP free?

FluentSMTP has a free version on WordPress.org.

Is SureMail free?

SureMail has a free version on WordPress.org.

Feature data last changed 11 Oct 2026. Spotted something wrong? Suggest an edit to FluentSMTP or SureMail. Some links are affiliate links. We may earn a commission at no cost to you; it never affects our data or rankings.