What is this?

This knowledgebase contains questions and answers about PRTG Network Monitor and network monitoring in general. You are invited to get involved by asking and answering questions!

Learn more

PRTG Network Monitor

Intuitive to Use. Easy to manage.
More than 500,000 users rely on Paessler PRTG every day. Find out how you can reduce cost, increase QoS and ease planning, as well.

Free Download

Top Tags

View all Tags

SMTP delivery Error Gmail 501-5.5.4 HELO/EHLO argument "" invalid, closing connection



Your Vote:



I was unable to send email notifications using my gmail account settings. The error was due to the use of unknown HELO/EHLO identifier in the notification delivery settings in my PRTG server.

501-5-5-4-helo-ehlo-argument closing-connection gmail-smtp-settings nvalid

Created on Nov 3, 2017 5:56:53 PM by  erofadd (0) 1


Nobody has replied yet

Why not be the first?

Please log in or register to enter your reply.

Disclaimer: The information in the Paessler Knowledge Base comes without warranty of any kind. Use at your own risk. Before applying any instructions please exercise proper system administrator housekeeping. You must make sure that a proper backup of all your data is available.