> my question is this:
>
> 1. given the default install and looking at the logs it seems i can send
> emails to external recipients but not on internal recipients????...anyone
> from the list who  encounters similar problems?


Not that problem. 

I gave up on sendmail due to load and other reasons also so complicated to do 
the basics. and so easy to break with one mistake.

I moved to 
Postfix  - SMTP
Dovecot - IMAP and POP3
Horde - Web Mail, calendar , notes, todo list, password management
openldap - users - aliases - addressbook
Ldap-Account-manager - manager the LDAP fully
spamassassin - gets 80% junk mail sorted.
amavisd - gets some more junk and banned items
clamantivirus - all viruses removed
sshdfilter to allow access if i need but block if attacked.
I have it set to check for blacklisted IP addresses

It does not allow relay

It also allows some users internal sending of email only and some external and 
internal sending. Some i have set to only send to single domain outside.

That was the best so far, still slowly adding to it to improve performance and 
controls.






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