Issues

contact_mail
Contact Form 7: REST API request failed: 503 Service Unavailable
A 503 Service Unavailable response stops Contact Form 7 from sending data...
apiREST APIerror503descriptioncontact-form-7
contact_mail
Contact Form 7: REST API request failed: 429 Too Many Requests

The form tries to send data through the WordPress REST API. The...

apiREST APIerrorerrorsecurityfirewalldescriptioncontact-form-7settingsserver_configuration
contact_mail
Contact Form 7: File upload error: temporary directory missing

The error appears when Contact Form 7 cannot locate a writable temporary...

codePHPcloud_offupload erroradmin_panel_settingspermissionsdescriptiontemporary filedescriptioncontact-form-7
contact_mail
Contact Form 7: REST API request failed: 401 Unauthorized

The form tries to send data via the WordPress REST API. The...

apiREST APIadmin_panel_settingspermissionsdescriptioncontact-form-7lock401
contact_mail
Contact Form 7: Mail (2) sending failed: PHP mail() function disabled

Contact Form 7 reports a failure for Mail (2) when the PHP...

codePHPerrorerrordescriptioncontact-form-7mailMailsettingsserver_configuration
dns
Contact Form 7: Mail (2) sending failed: SMTP connection timed out

The form tries to send a confirmation email through an external SMTP...

hourglass_bottomTimeouterrorerrorcodecURLlinkconnection
contact_mail
Contact Form 7: Mail (2) sending failed: SSL certificate verification failed

Contact Form 7 reports a failure when trying to send the secondary...

errorerrorlocksslcodecURLdescriptioncontact-form-7
contact_mail
Contact Form 7: Invalid mail (2) – Invalid ‘Bcc’ address

Contact Form 7 validates every header before sending mail. The Bcc header...

errorerrorwarningvalidationdescriptioncontact-form-7mailMail
contact_mail
Contact Form 7: Mail (2) sending failed: SMTP authentication error

Contact Form 7 tries to send email through WordPress mail system. When...

errorerrorlinkconnectiondescriptioncontact-form-7mailMailextensionplugin
contact_mail
Contact Form 7: Invalid mail (2) – Invalid ‘Subject’ header

The mail routine stops because the Subject line does not meet RFC‑2822...

warningvalidationdescriptioncontact-form-7mailMailtitlesubjecttext_fieldsheader
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