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2025/4/8 -Fix 501 Syntax HELO Hostname Error in JIRA or Confluence by editing hosts file or updating DNS settings. Learn how to resolve it.
2025/6/30 -Fix 501 Syntax: HELO hostname error in Bitbucket Data Center by resolving hostname issues in the /etc/hosts file.
Regarding the 501 error, we were successful keeping the delivery_method: :smtp using postfix by adding an extra "domain:" option to the email.yml config file.
2012/12/21 -It is actually a valid message meaning that someone is connecting with a blank hostname and it is actually hMS that is doing the rejection.
2018/10/11 -I am getting an NodeMailer error when I try to connect to my NodeMailer SMTP server (which happens to be on the same machine):
The HELO command is used to identify the domain name of the sending host to SMTP. This command is used to initiate a mail transaction, and must be sent (once) ...
2008/1/5 -Hi i am currently trying to make a registration system that sends out mails containing username and passwords etc. I have successfully made ...
The hostname provided during the HELO command with the SMTP server does not appear in the messages themselves (only maybe in the header). You can set it to ...
2013/8/27 -It's not wrong but it's too restrictive. This restriction rejects the request when the HELO or EHLO hostname has no DNS A or MX record.
2007/1/28 -... HELO and EHLO command should send Domain information and not Host information: Syntax: ehlo = "EHLO" SP Domain CRLF helo = "HELO" SP Domain CRLF