Sendmail adding extra domain to recipient address

[Mark Bly]

Hi,

System: HP-UX 11i
We have configured sendmail to send to a test smtp relay so that we can see if our emails are being sent correctly.
We have noticed that if we send to an address with a local domain extension, it adds the domain again to the end of the address.
e.g
recipient: mark.bly@somedomain.co.uk
becomes: mark.bly@somedomain.co.uk.somedomain.co.uk

We have used both elm and mailx to send the Emails with the same results.
Sending mail from another Unix server to the same test relay does not have this issue.
Unfortunately we can not find any differences in the sendmail.cf file.

Has anyone seen this before or have an idea where we can look?

Thanks in advance

[Avinash20]

cat /etc/hosts| grep somedomain.co.uk

cat sendmail.cf | grep somedomain.co.uk

[Mark Bly]

Hi,

Obviously the cat /etc/hosts will pick up the domain name as it is our local domain.
We actually use DNS but the hosts file still contains a few test entries.

The only entries in sendmail.cf are for the relay and the DM entry.
e.g

DS server.somedomain.co.uk
DM somedomain.co.uk

Where server is the relay server.

This is identical to the server that sends Email correctly.

Where else could the recipient address be picking up the extra domain entry?

[Mark Bly]

It turned out to be a DNS issue.

An nslookup of domain.co.uk was coming back with domain.co.uk.domain.co.uk.

After changing the DNS entry it worked fine.