When using the Sendmail email transfer agent or an app that depends on Sendmail for email delivery, the error message “Sendmail authinfo failed” frequently appears. Bobcares, as a part of our Server Management Service offers solutions to every Sendmail query that comes our way.

Fixing the “sendmail authinfo failed” Issue

Using the Sendmail email transfer agent or an app that depends on Sendmail for email delivery would often result in the error message “sendmail authinfo failed”. When trying to log in with an SMTP, this error typically means that there was an issue with the authentication information provided for delivering the email.

Troubleshooting Tips

The following are some typical reasons for the issue and how to fix them:

1. Firstly, make sure that the hostname or IP address and port of the SMTP server are appropriately defined in the Sendmail setup. Check again for any typos or errors.

2. Then, check that the SMTP server address we are using is the right one for the email provider we are attempting to use. SMTP server addresses vary amongst email providers.

3. Now, make sure we have provided the right username and password for the account we are using to send emails if the SMTP server requests authentication (this is typical for most SMTP servers).

4. Also, verify again that the username and password don’t contain any extra spaces, unusual characters, or mistakes.

5. Check to see if the account we’re using has the rights needed to send email through the SMTP server.

6. Some SMTP servers need SSL/TLS-secured connections. So, make sure that the proper security settings (such as SSL or TLS) are enabled in the Sendmail or email client.

7. Check to see if the proper port is being used for secure communications (for instance, 465 for SMTPS, or 587 for STARTTLS).

8. In order to confirm that outgoing connections on the designated SMTP port are permitted, check the firewall settings.

9. Also, check to see if the server or network is preventing users from sending emails to the SMTP server.

10. Check to see if the SMTP server we’re attempting to connect to is up and running and not having any problems. We can also contact the email service provider to find out the status.

11. Try setting up and sending email using a different email client or tool to see if the error persists in order to narrow down the problem. This can assist in figuring out whether the issue is particular to the Sendmail settings or represents a bigger issue.

12. For more thorough error messages, check the error logs produced by Sendmail or the email program. These logs might offer precise details regarding the reason for the authentication failure.

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Conclusion

To sum up, we provide 12 different steps from our Tech team to fix the “sendmail authinfo failed” issue.