smtp; 553 sorry, invalid HELO hostname (#5.7.1)

[ltoso]

Hi,
my email server is sending emails to gmail, yahoo and other free email service providers but when i send email to rediffmail.com it gives the following error

smtp; 553 sorry, invalid HELO hostname (#5.7.1)

after looking at the internet for solution it says that this type of error comes when the hostname set inside cpanel doesn't lead to an ip address or is not FQDN but in my case i have checked the hostname and checked if my hostname leads to an ip address on pinging it does

Please recommend

 

[cPanelMichael]

Hello

Could you let us know the specific output from /var/log/exim_mainlog when this happens? EX:

exigrep [email protected] /var/log/exim_mainlog

Thank you.

 

[ltoso]

Hi,
following is the output of the above command, i have just replaced my sending email id with [email protected] and rediff email id to [email protected] and the ip from which i am sending to xxx.xxx.xxx.xxx to keep my info private

2016-01-04 05:34:06 1aG1ee-000383-SW ** [email protected] R=dkim_loo                                                                                        kuphost T=dkim_remote_smtp H=mx.rediffmail.rediff.akadns.net [202.137.234.30] X=                                                                                        TLSv1:DHE-RSA-AES256-SHA:256 CV=no: SMTP error from remote mail server after RCP                                                                                        T TO:<[email protected]>: 553 sorry, invalid HELO hostname (#5.7.1)
2016-01-04 05:34:06 1aG1ee-000383-SW Completed

 

[cPanelMichael]

You may need to consult with the administrator of this particular remote mail server and ask them to provide you with the specific reason your message has been rejected. As far as general advice, this document is helpful:

How to Keep your Email out of the Spam Folder - cPanel Knowledge Base - cPanel Documentation

Thank you.