SMTP Error: 454 4.7.0 Too many login attempts, please try again later
<p>I have set up SMTP server with gmail account. It was working fine till few days back. When I checked the logs I found below entry in it:</p>

<pre><code>SMTP Error: 454 4.7.0 Too many login attempts, please try again later.
</code></pre>

<p>I have restarted SMTP service twice. I have checked the configuration that was set up using <a href="http://www.vsysad.com/2014/09/setup-and-configure-smtp-server-on-windows-server-2012/" rel="noreferrer">this</a> link. Everything is same as we have set up. I have restarted the SMTP server &amp; the machine too.</p>

<p>I have checked for 2 step verification settings. It is not enabled. I have checked for "less secure" apps settings and it is set to Enabled as suggested <a href="https://stackoverflow.com/questions/27367327/gmail-too-many-login-attempts">here</a>. </p>

<p>I have checked apps enabled as suggested <a href="https://stackoverflow.com/questions/34921053/gmail-app-google-smtp-error-454-4-7-0-too-many-login-attempts-please-try-ag">here</a> using below link. </p>

<p><a href="https://security.google.com/settings/security/permissions?pli=1" rel="noreferrer">https://security.google.com/settings/security/permissions?pli=1</a></p>

<p>But no apps are added. Can anyone suggest anything that I need to look for? Thanks in advance.</p>