Nagios Support Forum

Posted: **Tue Apr 07, 2015 10:51 pm**

Hi,

Recently, my email notifications stops sending proper email notifications and it sends a Delivery Failure email to my mailbox instead.

This is what I got from sending a test email:

Code: Select all

Could not deliver message to the following recipient(s):

Failed Recipient: [u]my_email_address[/u]
Reason: Remote host said: 550 Authentication is required for relay


   -- The header and top 20 lines of the message follows --

Received: from NagiosCentOS6.localdomain ([u]my_mail_server[/u] [[u]my_public_ip[/u]]) by secured200.zonecybersite.com with SMTP;
   Wed, 8 Apr 2015 11:19:15 +0800
Received: by NagiosCentOS6.localdomain (Postfix, from userid 48)
	id 7D3B24524C; Wed,  8 Apr 2015 11:19:16 +0800 (SGT)

I google 550 and it means outgoing server (SMTP) requires authentication, however I am using sendmail.
How should I check from here?

Posted: **Wed Apr 08, 2015 1:36 pm**

You would have to check with your internet service provider to see if they now require authentication for relaying SMTP emails.
Here is a quick link for how to setup authentication for Sendmail relaying.
https://members.swcp.com/wiki/Configure ... _Auth_SMTP

Posted: **Wed Apr 08, 2015 9:35 pm**

tgriep wrote:You would have to check with your internet service provider to see if they now require authentication for relaying SMTP emails.
Here is a quick link for how to setup authentication for Sendmail relaying.
https://members.swcp.com/wiki/Configure ... _Auth_SMTP

Hi,
It appears we have a recent migration of mail server. I switched to smtp and changed mail user name using the full address and it is fixed now. Thanks.

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