Title: Error api_key: invalid
Last modified: April 30, 2026

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# Error api_key: invalid

 *  Resolved [alertabem](https://wordpress.org/support/users/alertabem/)
 * (@alertabem)
 * [3 weeks, 2 days ago](https://wordpress.org/support/topic/error-api_key-invalid/)
 * My email is presenting following error message:
 * **Atenção! Seu site não conseguiu enviar o e-mail mais recente.**
 * **Fonte do e-mail: broken-link-checker-seo**
 * **Mailer: SMTP.com**
 * **api_key: invalid**
 * **For more details please try running an Email Test or reading the latest [error event](https://alertabem.com.br/wp-admin/admin.php?page=wp-mail-smtp-tools&tab=debug-events).**
 * The page I need help with: _[[log in](https://login.wordpress.org/?redirect_to=https%3A%2F%2Fwordpress.org%2Fsupport%2Ftopic%2Ferror-api_key-invalid%2F%3Foutput_format%3Dmd&locale=en_US)
   to see the link]_

Viewing 1 replies (of 1 total)

 *  [Ravi Khadka](https://wordpress.org/support/users/ravikhadka/)
 * (@ravikhadka)
 * [3 weeks, 2 days ago](https://wordpress.org/support/topic/error-api_key-invalid/#post-18894863)
 * Hi,
 * `api_key: invalid` usually means the SMTP.com API key saved in WP Mail SMTP is
   incorrect, expired, or does not match the SMTP.com account currently being used.
 * I would check this first:
    1. Open WP Mail SMTP settings
    2. Re-copy and paste the API key directly from your SMTP.com account
    3. Make sure there are no extra spaces before or after the key
    4. Save the settings and run a new Email Test
 * If it still fails, then:
    1. confirm the SMTP.com account is active
    2. generate a new API key in SMTP.com
    3. replace the old key in WP Mail SMTP
    4. test again
 * So this looks more like an SMTP.com credential issue than a problem with Broken
   Link Checker itself.

Viewing 1 replies (of 1 total)

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## Tags

 * [apikey](https://wordpress.org/support/topic-tag/apikey/)

 * 2 replies
 * 2 participants
 * Last reply from: [Ravi Khadka](https://wordpress.org/support/users/ravikhadka/)
 * Last activity: [3 weeks, 2 days ago](https://wordpress.org/support/topic/error-api_key-invalid/#post-18894863)
 * Status: resolved