Yahoo! JAPAN

2018/7/31 -Cause. Server's hostname is not defined, so Fisheye sends the server's IP address instead of the hostname. Resolution. Edit /etc/hosts ...

2023/10/9 -The 501 error message notes when there is a syntax error with the parameters or arguments. In this case, the email server cannot process the ...

2016/2/26 -Server's hostname is not defined, so Confluence or JIRA sends the server's IP address instead of the hostname on the HELO SMTP command.

I have Postfix configured on the same machine hosting a redmine site. I am now using Postfix and Courier for IMAP/POP/SMTP services, and all is well.

2006/12/1 -Hi, I am getting an error message : "MessagingException: 501 Syntax: HELO hostname" when trying to send mail using Java Mail API.

2012/12/12 -However, I get an error "MessagingException: 501 Syntax: HELO hostname" when trying to send an email using mail.smtp.host = 127.0.0.1. My ...

2012/12/21 -It is about some email client issuing broken command on smtp server. ehlo and helo commands require at least one parameter. HELO checks kick in ...

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 ...

2022/11/17 -Cause. Server's hostname is not defined, so Cognos server sends the server's IP address instead of the hostname on the HELP SMTP command.

2011/2/2 -... 501 Syntax: HELO hostname " The setting in hosts.template file is as below : 127.0.0.1 localhost localhost.localdomain 124.153.104.21 FQDN