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mailx SMTP; 554 Domains without a subdomain are not allowed

While I’m trying to send mail to another domain mail id from root linux terminal using by mailx, It shows the below error

SMTP; 554 Domains without a subdomain are not allowed

first my mind focused on sendmail configuration , Is any configuration issues there while configure sendmail?. But I checked everything here, I can not found any solutions from here. Finally I found the solution.

Solution :

Add hostname with domain in hosts file

[root@siebelpoc ~]# cat /etc/hosts #

Do not remove the following line, or various programs # that require network functionality will fail.

127.0.0.1                localhost.localdomain localhost

::1             localhost6.localdomain6 localhost6

10.xx.xx.xx  domaintest.xxx.com  domaintest

After add it  here, just restart the network service. you can able to send mail other domain related mail id like (mail@yyy.com).

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