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Sending email fails due to 501 Syntax: HELO hostname error

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


Sending Email Fails Due to 501 Syntax: HELO Hostname Error

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  2. confkb
  3. sending-email...

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.


"Email could not be sent" error when sending mail from APM CE (CEM).

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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 SMTP command "HELO ...


501 Syntax: HELO hostname - Postfix - Redmine

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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.


MessagingException: 501 Syntax: HELO hostname. Very Urgent

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Hi, I am getting an error message : "MessagingException: 501 Syntax: HELO hostname" when trying to send mail using Java Mail API. Can anyone plz help me.


[SMTP Error] 501 Syntax: helo needs hostname (V 5.3.2) - hMailServer

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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.


Mail Server with javax.mail and CentOS - Stack Overflow

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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 ...


Sending Mail via SMTP fails, because of "Caused by: jakarta.mail ... - GitHub

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  2. keycloak
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When we try to send a testmail it always fails with: "Caused by: jakarta.mail.MessagingException: 501 Syntax: HELO ". I also tried to set a hostname for the ...


Sending Mail via SMTP fails, because of "Caused by: jakarta.mail ... - GitHub

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  2. keycloak
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2024/6/23 -When we try to send a testmail it always fails with: "Caused by: jakarta.mail.MessagingException: 501 Syntax: HELO ". I also tried to set a ...


SMTP problem( 501 Syntax: HELO hostname) - smartfoxserver.com

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2008/1/5 -The error is not local (ie can't use the network, can't contact the smtp etc... ) but is caused by a problem in the server-to-server communication.