IP blocked because: (smtpauth) Failed SMTP AUTH login from - can someone explain?

Posted by gdaniel on Pro Webmasters See other posts from Pro Webmasters or by gdaniel
Published on 2014-08-19T20:03:06Z Indexed on 2014/08/19 22:34 UTC
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smtp

Today I had a few users blocked in our server firewall because of:

(smtpauth) Failed SMTP AUTH login from

Can someone explain the reason? What does it exactly mean? Could someone be using the our website to access SMTP for spamming purpose?

UPDATE:

Server info: Centos OS with CPanel and WHM. However no one has access to either.

Taking a look at the logs it looks like someone repetitively attempted to login with a known existent user/pass.

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Developer IT

IP blocked because: (smtpauth) Failed SMTP AUTH login from - can someone explain? - Developer IT

IP blocked because: (smtpauth) Failed SMTP AUTH login from - can someone explain?

smtp

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