MailerSend – Official SMTP Integration

Improve your deliverability and avoid the spam box with MailerSend’s SMTP server. Check your analytics to improve your emails for better conversion!

v1.0.8MailerSendUpdated Added 2k+ installs56% rating
40
Score
39
Errors
25
Warnings
+0
Change

Category Scores

Security0
Repo80
Performance100
Maintainability88

Issues to Review

Prioritized issue groups from the latest Plugin Check scan

64 findings

Security

41

6 issue groups

I18n

11

4 issue groups

Maintainability

7

5 issue groups

Repo Compliance

5

5 issue groups

ERRORSecurityUnsafe printing functionAll output should be run through an escaping function (like esc_html_e() or esc_attr_e()), found '_e'.21
Category
Security
Occurrences
21
Severity
error

Sample message

All output should be run through an escaping function (like esc_html_e() or esc_attr_e()), found '_e'.

WARNINGSecurityRequest data is not unslashed$_POST['bcc_recipient'] not unslashed before sanitization. Use wp_unslash() or similar10
Category
Security
Occurrences
10
Severity
warning

Sample message

$_POST['bcc_recipient'] not unslashed before sanitization. Use wp_unslash() or similar

WARNINGSecurityMissing nonce verificationProcessing form data without nonce verification.5
Category
Security
Occurrences
5
Severity
warning

Sample message

Processing form data without nonce verification.

ERRORI18nMissing Arg DomainMissing $domain parameter in function call to __().4
Category
I18n
Occurrences
4
Severity
error

Sample message

Missing $domain parameter in function call to __().

ERRORI18nMissing Translators CommentA function call to __() with texts containing placeholders was found, but was not accompanied by a "translators:" comment on the line above to clarify the meaning of the placeholders.4
Category
I18n
Occurrences
4
Severity
error

Sample message

A function call to __() with texts containing placeholders was found, but was not accompanied by a "translators:" comment on the line above to clarify the meaning of the placeholders.

ERRORSecurityOutput is not escapedAll output should be run through an escaping function (see the Security sections in the WordPress Developer Handbooks), found '__'.3
Category
Security
Occurrences
3
Severity
error

Sample message

All output should be run through an escaping function (see the Security sections in the WordPress Developer Handbooks), found '__'.

WARNINGMaintainabilityNon-prefixed global variableGlobal variables defined by a theme/plugin should start with the theme/plugin prefix. Found: "$option".2
Category
Maintainability
Occurrences
2
Severity
warning

Sample message

Global variables defined by a theme/plugin should start with the theme/plugin prefix. Found: "$option".

WARNINGMaintainabilityerror log error logerror_log() found. Debug code should not normally be used in production.2
Category
Maintainability
Occurrences
2
Severity
warning

Sample message

error_log() found. Debug code should not normally be used in production.

ERRORI18nNon Singular String Literal TextThe $text parameter must be a single text string literal. Found: '<a href="' . esc_url( admin_url( 'plugins.php' ) ) . '">Deactivate</a>'2
Category
I18n
Occurrences
2
Severity
error

Sample message

The $text parameter must be a single text string literal. Found: '<a href="' . esc_url( admin_url( 'plugins.php' ) ) . '">Deactivate</a>'

ERRORMaintainabilitydate datedate() is affected by runtime timezone changes which can cause date/time to be incorrectly displayed. Use gmdate() instead.1
Category
Maintainability
Occurrences
1
Severity
error

Sample message

date() is affected by runtime timezone changes which can cause date/time to be incorrectly displayed. Use gmdate() instead.

Show 10 more
WARNINGSecuritywp redirect wp redirect1
Category
Security
Occurrences
1
Severity
warning

Sample message

wp_redirect() found. Using wp_safe_redirect(), along with the &quot;allowed_redirect_hosts&quot; filter if needed, can help avoid any chances of malicious redirects within code. It is also important to remember to call exit() after a redirect so that no other unwanted code is executed.

WARNINGSecurityInput is not sanitized1
Category
Security
Occurrences
1
Severity
warning

Sample message

Detected usage of a non-sanitized input variable: $_POST[&#039;smtp_pass&#039;]

WARNINGMaintainabilityNot In Footer1
Category
Maintainability
Occurrences
1
Severity
warning

Sample message

In footer ($in_footer) is not set explicitly wp_enqueue_script; It is recommended to load scripts in the footer. Please set this value to `true` to load it in the footer, or explicitly `false` if it should be loaded in the header.

ERRORI18nMixed Ordered Placeholders Text1
Category
I18n
Occurrences
1
Severity
error

Sample message

Multiple placeholders in translatable strings should be ordered. Mix of ordered and non-ordered placeholders found. Found: "%1s, %2$s" in 'Click %1sDelete information%2$s if you want to uninstall the plugin and remove all crucial data stored in the database. This will remove all your settings and deactivate the plugin. Warning! This action can’t be undone.'.

ERRORMaintainabilityMissing direct file access protection1
Category
Maintainability
Occurrences
1
Severity
error

Sample message

PHP file should prevent direct access. Add a check like: if ( ! defined( 'ABSPATH' ) ) exit;

ERRORRepo Complianceoutdated tested upto header1
Category
Repo Compliance
Occurrences
1
Severity
error

Sample message

Tested up to: 6.9 < 7.0. The "Tested up to" value in your plugin is not set to the current version of WordPress. This means your plugin will not show up in searches, as we require plugins to be compatible and documented as tested up to the most recent version of WordPress.

WARNINGRepo Complianceplugin header invalid domain path1
Category
Repo Compliance
Occurrences
1
Severity
warning

Sample message

The "Domain Path" header in the plugin file must start with forward slash.

WARNINGRepo Complianceplugin header nonexistent domain path1
Category
Repo Compliance
Occurrences
1
Severity
warning

Sample message

The "Domain Path" header in the plugin file must point to an existing folder. Found: "-"

ERRORRepo Compliancereadme mismatched header requires php1
Category
Repo Compliance
Occurrences
1
Severity
error

Sample message

Mismatched Requires PHP: 7.4 != 7.2.5. "Requires PHP" needs to be exactly the same with that in your main plugin file's header.

WARNINGRepo Compliancereadme parser warnings too many tags1
Category
Repo Compliance
Occurrences
1
Severity
warning

Sample message

One or more tags were ignored. Please limit your plugin to 5 tags.

External Connections

Potential connections found in static code analysis.

4 domains

Outbound calls

10

External assets

0

Incoming endpoints

0

Notable Domains

mailersend.com6 · outbound
app.mailersend.com2 · outbound
capterra.com1 · outbound

Platform / Reference Domains

gnu.org1 · platform/reference

External Asset Domains

No external asset domains detected.

Incoming Endpoints

No public endpoints detected.

Score History

2 score snapshots

+0
1007550250Jun 21, 2026, 02:46 PM UTC Score 40/100 Plugin v1.0.6 Plugin Check 2.0.0 39 errors, 25 warningsJun 26, 2026, 12:05 PM UTC Score 40/100 Plugin v1.0.8 Plugin Check 2.0.0 39 errors, 25 warningsJun 21, 2026Jun 26, 2026

v1.0.8

40

Latest

Findings
64
Errors
39
Warnings
25
Check
2.0.0

v1.0.6

40

Score

Findings
64
Errors
39
Warnings
25
Check
2.0.0

Relationship Map

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32 nodes

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