sendmail issue sending through mail relay.

[jmckinzie]

Getting an error when trying to send mail through mail relay.

email.address@comp.com... Connecting to citi.com via esmtp...
email.address@comp.com... Host unknown (Name server: comp.com: no data known)
/dead.letter... Saved message in /dead.letter

I have copied my sendmail.cf from a working server...still getting this issue.

Any ideas?

[Matti_Kurkela · Accepted solution]

Does the server from where you copied the sendmail.cf use a different DNS server?

Are the DNS settings (/etc/nsswitch.conf, /etc/resolv.conf) correct in the server you're trying to send email from?

The error messages suggest that this server cannot get information from the DNS for some reason.

MK

[jmckinzie]

I had to also change the default /etc/mail/sendmail.cf file (from a working server)