Hi All, Up until a few months ago the ISP of the network in question was happy to accept and relay messages from my server <myserver.mydomain.com> which runs nagios. My server gets its IP address from the ISP in question dynamically so I use DynDNS to map the subdomain.domain name to it.
To be able to relay messages I of course have set up sendmail to authenticate using email_acco...@isp.com/passwd_on_ISP. When the ISP stopped accepting messages I started getting this error message: ================================================================ -----The following addresses had permanent fatal errors----- <email_acco...@isp.com> (reason: 550 5.1.0 <nag...@myserver.mydomain.com> sender rejected : invalid sender domain) -----Transcript of session follows ----- ... while talking to smtp.ISP.com: >>> MAIL From:<nag...@myserver.mydomain.com> SIZE=745 AUTH=<> <<< 550 5.1.0 <nag...@myserver.mydomain.com> sender rejected : invalid sender domain 554 5.0.0 Service unavailable ================================================================ Does this fail because the ISP's reverse DNS on my dynamically allocated IP address resolves to an ISP domain instead of myserver.mydomain.com? Is there something I could change in the configuration of my server to make this work again? -- Regards, Mick
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