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Outgoing email problem -> 550 Access denied – Invalid HELO name

  • 29/06/2018
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550 Access denied – Invalid HELO name (See RFC5321 4.1.1.1) is a very common problem when sending emails from webmail (Roundcube, Horde etc) or via SMTP.

The solution is very simple. Continue reading…

  • CentOS cPanel Linux SSH Troubleshooting WHM

A better backup system for WHM/cPanel – Jet Backup Manager

  • 23/03/2016
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Although WHM/cPanel is an excellent software bundled with a lot of features, I always wanted something better than the original backup system. Something that will allow better backup management, and give the ability to end users to restore backups themselves from cPanel without having to do this from WHM. Continue reading…

  • Cloudlinux cPanel guide WHM

Change dedicated WHM IP to shared

  • 15/08/2015
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I have recently had an issue with a VPS migrated to a new machine with new IP. I changed the IP of one account from WHM but then this became dedicated and I wa not able to change the remaining accounts to the new IP. Continue reading…

  • CentOS cPanel Troubleshooting WHM

How to get help for cPanel/WHM issues

  • 14/06/2015
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A lot of people have problems with WHM/cPanel. The fact is that you get support from both cPanel and also the company that sold you the cPanel license. Continue reading…

  • cPanel Troubleshooting WHM

“Bad” news for RKHunter users

  • 06/06/2015
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Many of us are using RKHunter plugin from Admin-Ahead in order to secure our servers from rootkits. This plugin was free and excellent for finding and removing rootkits. Continue reading…

  • cPanel Troubleshooting WHM
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Michalis Michailidis

Master of SEO, server management specialist, guru of web development. A living legend.

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  • How to easily find infected/hacked files from the command line 24/11/2018
  • Roundcube emails not showing after migration 24/11/2018
  • Outgoing email problem -> 550 Access denied – Invalid HELO name 29/06/2018
  • Email delivery issue 550-5.7.1 not meet IPv6 guidelines 12/06/2018
  • Security alert – PHPMailer Exploit [Critical] temporary fix 30/12/2016
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