by
CybexSoft
5 (2 reviews)
Cybexsoft SMTP
Reliable transactional email for WordPress. Connect a real mailer, log every message, retry what fails, and diagnose deliverability issues.
Cybexsoft SMTP ranks #68,448 among WordPress.org plugins with 0+ active installations, is #2,868 of 3,634 in the Communication category, a 5/5 rating from 2 reviews, and was last updated Oct 21, 2026. Data from WordPress.org, refreshed twice daily — see methodology.
Compatible with WP 7.1.4
v1.1.0
Current Version v1.1.0
Updated 2 weeks ago
Last Update on 21 Oct, 2026
Refreshed 1 week ago
Last Refreshed on
#2,868 of 3,634 in Communication
Actively maintained
Rank
#68,448
—
No change
Active Installs
0+
-100%
KW Avg Position
98
1 worse
Downloads
487
+2 today
Support Resolved
0%
—
No change
Rating
100%
Review 5 out of 5
5
(2 reviews)
Next Milestone 10
0+
10+
40,880
Ranks to Climb
-
Growth Needed
8,000,000
Active Installs
Pro
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Current
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5.0
2 reviews
Overall
100%
5
2
(100%)
4
0
(0%)
3
0
(0%)
2
0
(0%)
1
0
(0%)
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- Version
- 1.1.0
- Last Updated
- Oct 21, 2026
- Requires WP
- 5.5+
- Tested Up To
- 7.1.4
- PHP Version
- 7.4 or higher
- Author
- CybexSoft
Support & Rating
- Rating
- ★ ★ ★ ★ ★ 5
- Reviews
- 2
- Support Threads
- 0
- Resolved
- 0%
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Frequently Asked Questions
Common questions about Cybexsoft SMTP
PHP 7.4 through the latest stable release.
Not on any normal host. Passwords, API keys and OAuth tokens are encrypted before they are written to the database (XSalsa20-Poly1305 via PHP's sodium extension), so a leaked database backup or an SQL injection in some other plugin does not expose working mail credentials. The key is derived from your site's WordPress salts; if you rotate your salts on a schedule, define CYBEX_SMTP_ENCRYPTION_KEY in wp-config.php first so stored credentials survive the rotation. Sodium has been compiled into PHP by default since 7.2, so it is present on every version this plugin supports. The one exception is a host that has deliberately built PHP without it — there is then nothing to encrypt with, and credentials are stored as you typed them. If that matters to you, ask your host whether sodium is enabled, or look for it in a phpinfo report. Either way, you can keep a credential out of the database entirely by defining it in wp-config.php — CYBEX_SMTP_PASSWORD, CYBEX_SMTP_SES_PASSWORD, CYBEX_SMTP_SENDGRID_API_KEY, CYBEX_SMTP_MAILGUN_API_KEY, CYBEX_SMTP_BREVO_API_KEY, CYBEX_SMTP_SMTP2GO_API_KEY or CYBEX_SMTP_SPARKPOST_API_KEY. A defined constant overrides whatever is stored, and is never written back to the database. If sodium is missing and a credential is stored anyway, the plugin now says so in the admin rather than leaving you to find out from this page.
Click Get Pro for Free in the plugin header (or next to Settings on the Plugins screen), fill in the short form, and we will email you the Pro download along with your license key. The download is a separate plugin, Cybexsoft SMTP Pro, which you install alongside this one: Plugins → Add New → Upload Plugin, then activate. Keep Cybexsoft SMTP active — Pro extends it and will say so if it is missing. Your settings and email log stay exactly where they are, and everything Pro adds appears on the same settings screen, so there is still only one place to configure anything.
No. They are two separate plugins, so an update to this one cannot touch the other. Update either from the Plugins screen whenever you like. It used to be a real risk, and this is why the two were separated. Pro was once shipped as this same plugin with the extra code included, which meant an update from WordPress.org replaced the whole directory and took the Pro code with it — leaving the license behind and the features gone. Nothing to watch out for now.
The License tab in Cybexsoft SMTP. Paste the key we emailed you there. With the Pro plugin not yet installed the key is saved but shown as unverified, because nothing on this side can check one — activating Cybexsoft SMTP Pro verifies it.
The form sends its request through the very mailer this plugin configures, so a site that has not finished setting one up cannot email us either. When that happens the form offers a link that opens the same request in your own email app instead — nothing is lost.
A message that was deliberately not sent, rather than one that failed. It appears when your block list stops a message before it reaches your mailer — the row records who it was for and which rule matched. Blocked rows are counted separately from failures and left out of your delivery rate, because nothing was ever handed to a mail server.
Yes, with WP-CLI. wp cybexsoft-smtp status is the quick check, and wp help cybexsoft-smtp lists the rest: test email, the retry queue, the email log, DNS checks, settings export and import, and the access lists. Each command exits non-zero when something needs attention, so wp cybexsoft-smtp status can sit in a cron job or a monitoring check.
Yes, through a read-only REST API. GET /wp-json/cybexsoft-smtp/v1/stats returns totals, the accepted rate, daily counts, each mailer's figures and the retry queue (?days= from 1 to 365); GET /wp-json/cybexsoft-smtp/v1/log returns the email log a page at a time (page, per_page up to 100, status, search, after), and /log/{id} a single entry. Nothing can be changed through it. It needs an administrator: create an application password under Users → Profile and send it as HTTP Basic auth over HTTPS.
Yes. Network-activate it and go to Network Admin → Settings → Cybexsoft SMTP to set one mailer for every site, with or without letting sites choose their own. Activated on single sites instead, each site is set up on its own as usual. Cybexsoft SMTP Pro's mailers are set up per site.
