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Top Forums UNIX for Dummies Questions & Answers can not send mail from unix server to company/yahoo mail Post 32215 by RTM on Wednesday 20th of November 2002 01:41:55 PM
Old 11-20-2002
Check your /etc/mail/sendmail.cf file for the following:

# who I send unqualified names to (null means deliver locally)
DR

# who I masquerade as (null for no masquerading) (see also $=M)
DM

If there are no entries here, it may be that the user you attempted to send to is not in the /etc/passwd file and it did not know where to send this to thus it gives an error. Since you are sending to your domain (someuser@my_company.com) and if those fields are blank, then it did not know where to send the email to. So it checks /etc/passwd for the username. If it's not there, it can then check /etc/mail/aliases for an alias for the user name

somuser: someuser@otherserver.my_company.com

If there isn't an alias, it won't send.

At some point there has to be a mail server that knows about all the users. My environment had an Exchange server so all email not specifically for the internet (someone@not_my_domain.com) or not specifically for a local user or aliases ( allunixadmins: joe, tom, charlie, scott) would go to the Exchange server. If your Sendmail server will be the main mail hub, then all users must be listed in /etc/passwd or have an alias set up in /etc/mail/aliases.

You need to check out the FAQ at Sendmail and/or read the Sendmail book to figure out how you want to move mail around. Once you figure that out, more specific help can be given.
 

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aliases(4)						     Kernel Interfaces Manual							aliases(4)

NAME
aliases - Contains alias definitions for the sendmail program SYNOPSIS
/var/adm/sendmail/aliases DESCRIPTION
By default, the aliases file contains the required aliases for the sendmail program. Do not delete these defaults because they are needed by the system. This file describes user ID aliases used by the sendmail command. It is formatted as a series of lines in the form: name: name_1, name_2, name_3,.. The name is the name that needs an alias, and the name_n are the aliases for that name. Lines beginning with white space are continuation lines. Lines beginning with a # (number sign) are comments. You can define an alias only on local names. Duplicate addresses are removed and no message is sent to any person more than once. For example, if name_1 defines an alias that is name_2 and name_2 defines an alias that is name_1, sendmail does not send the same message back and forth. Local and valid recipients who have a .forward file in their home directory have messages forwarded to the list of users defined in that file. This is only the raw data file; the actual information that defines the aliases is placed into a binary format in the files /var/adm/send- mail/aliases.dir and /var/adm/sendmail/aliases.pag using the newaliases command. For the change to take effect, the newaliases command must be executed each time the aliases file is changed. The sendmail program also supports sending messages to programs or appending a message to a file. See the sendmail(8) reference page for further information. Special Aliases Directs error messages that occur when sending to aliasname back to address. RESTRICTIONS
Aliases for sendmail use the dbm(3) database format for faster lookups. A single alias cannot exceed 1,000 characters. To work around this restriction, you can chain together aliases. For example: alias-list: ali1, ali2, ali3 ali1: name 1, name 2 ... ali2: name n, name n + 1 FILES
Binary aliases file. Binary aliases file. RELATED INFORMATION
Commands: newaliases(1), forward(4), local.users(4), sendmail(8) delim off aliases(4)
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