5 Website Development Tips To Boost Your Business Growth Exponentially
550 Access denied – Invalid HELO name (See RFC2821 18.104.22.168)
How to fix:
This error means that there is no reverse DNS lookup for the domain sending the helo.
To fix this setup your hostname correctly with a valid host.domain.com and go to the authorized DNS server for that domain and create an A record which points to the corresponding IP Address.
Published on: Mar 03, 2021