FluentSMTP vs Solid Mail
Updated 11 Oct 2026. 23 features compared side by side.
Completely free, open-source SMTP plugin from WPManageNinja with native API mailers, email logs, resend, fallback and chat-app alerts.
Free SMTP plugin from SolidWP (formerly WP SMTP, now moving to Kadence) with provider presets, From-based routing, fallback and an email log.
Choose FluentSMTP if…
- You need Gmail & Google workspace and failure alerts
- You also want Microsoft 365 / Outlook and resend from the log
- You want the more complete feature set (89/100 vs 40/100)
- You prefer the more widely used option
Choose Solid Mail if…
- You need automatic retry & queue
FluentSMTP includes 8 features that Solid Mail lacks, including Gmail & Google Workspace, Microsoft 365 / Outlook and Setup wizard; Solid Mail has 1 that FluentSMTP lacks, including Automatic retry & queue. Both include 11 of the 23 features we track. 1 feature is not yet verified for one or both plugins.
At a glance
Feature comparison
Click a screenshot to see both plugins side by side.
FluentSMTP Solid MailSending & mailers8/85/8
Generic SMTP driver for any host, such as Yahoo, Outlook.com or cPanel mail.
Manual SMTP connection for any host with port, encryption and authentication.
API drivers for SES, SendGrid, Mailgun, Brevo, Postmark, SparkPost, SMTP2GO and more.
Presets for SendGrid, Mailgun, Brevo and Postmark; most connect via the provider's SMTP relay, not its API.
Gmail and Google Workspace connect through OAuth.
No Google OAuth; Gmail works only through manual SMTP with an app password.
Outlook/Office 365/Microsoft 365 connection via OAuth API, free.
No Microsoft OAuth; Outlook/365 only via manual SMTP settings.
Native Amazon SES API driver included free.
SES preset uses SES SMTP credentials and endpoint rather than the SES API.
Fallback connection is used when the default connection fails.
Default connection plus 'Use Alternative Connections on Failure' retries via other connections.
Routes each email to the connection matching its From address; no subject or plugin rules.
Each connection handles emails from its own From address; no other rule types.
Setup assistant to configure a connection and send a test email.
Per-provider setup forms but no guided wizard; test email is a separate tab.
Logs & monitoring5/73/7
Logs every email with headers, body and server response in its own table.
Mail Log records sender, recipient, subject, time and SMTP errors.
Resend any logged email singly or in bulk, failed or sent.
No resend option in the log.
No open or click tracking is offered.
No open or click tracking.
Instant failure alerts to Slack, Telegram, Discord or Pushover.
No email or chat alerts when sending fails.
No automatic retry queue; failed emails are resent manually or handled by the fallback.
Failed sends are retried immediately through another connection; no queue or delayed retries.
Dashboard sending charts plus a scheduled email summary of sent and failed totals.
No charts or summary reports.
Delete Logs setting keeps logs from 7 days up to 2 years.
Logging can be turned off and logs deleted or exported; no automatic retention period.
Email control3/42/4
Per-connection Force From Email and Force Sender Name options.
Each connection stores a From name and email, but there is no option to force one sender on all emails.
No settings to disable individual WordPress or WooCommerce notification emails.
No options to disable individual WordPress or WooCommerce emails.
Email Simulation logs emails without sending; also a constant to force it.
No option to block or simulate outgoing email.
Send plain or HTML test emails from settings or WP-CLI.
Email Test tab sends a test through a chosen connection and records errors.
Security & admin4/42/4
Keys encrypted with WordPress salts, or stored as wp-config constants.
Credentials are kept in the database without encryption; wp-config support was legacy (v1.1.10).
Works on multisite but is configured per subsite, with no network-wide settings.
Multisite support is not documented.
Every mailer and feature is in the free plugin; no Pro version exists.
Free plugin with no paid edition; all providers included.
WP-CLI commands for test, health, stats and prune-logs, plus constants.
REST endpoints for connections and a few filters; no documented hooks or WP-CLI.
Statuses: Yes Pro Add-on Partial 3rd-party No ?
Pricing compared
FluentSMTP Free
| Free | $0 |
|---|---|
| Free | Free lifetime, Unlimited |
Solid Mail Free
| Free | $0 |
|---|---|
| Free | Free per year, Unlimited |
Downloads trend
FluentSMTP
42,738 downloads last week
Solid Mail
1,361 downloads last week
Verdict
FluentSMTP scores higher on our feature checklist (89/100 against 40/100) and includes Gmail & Google workspace, failure alerts and Microsoft 365 / Outlook that Solid Mail does not. Solid Mail still has the edge on automatic retry & queue. Check the features you rely on in the table below before deciding.
Biggest differences
FluentSMTP: included. Solid Mail: not included. Gmail and Google Workspace connect through OAuth.
FluentSMTP: included. Solid Mail: not included. Instant failure alerts to Slack, Telegram, Discord or Pushover.
FluentSMTP: included. Solid Mail: not included. Outlook/Office 365/Microsoft 365 connection via OAuth API, free.
FluentSMTP: included. Solid Mail: not included. Resend any logged email singly or in bulk, failed or sent.
FluentSMTP: included. Solid Mail: not included. Keys encrypted with WordPress salts, or stored as wp-config constants.
FluentSMTP: included. Solid Mail: not included. Setup assistant to configure a connection and send a test email.
Written from the feature, pricing and install data on this page, not from hands-on testing. How we compare.
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FAQ
Which is better, FluentSMTP or Solid Mail?
FluentSMTP scores higher on our feature checklist (89/100 against 40/100) and includes Gmail & Google workspace, failure alerts and Microsoft 365 / Outlook that Solid Mail does not. Solid Mail 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 12 for Solid Mail. 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 Solid Mail free?
Solid Mail has a free version on WordPress.org.
Feature data last changed 11 Oct 2026. Spotted something wrong? Suggest an edit to FluentSMTP or Solid Mail. Some links are affiliate links. We may earn a commission at no cost to you; it never affects our data or rankings.