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Wyphorn
Asked: 2017-07-04 08:26:45 +0800 CST

sendmail "unknown user", mail forward task

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I have an ubuntu 16.04 web server with a forwarded mx record. On server, I installed sendmail. I have multiple vhosts runnning. One of them is "xxx-tele.com".

Now I want to setup sendmail that all mails sent to [email protected] should be forwarded to [email protected] which is a mailbox on a different mail server inside of my network.

First I added a /etc/mail/virtusertable with

[email protected]        [email protected]

and with "makemap hash virtusertable.db < virtusertable" I created the hash file. In /etc/mail/sendmail.mc I added the line

FEATURE(`virtusertable', `hash -o /etc/mail/virtusertable.db')dnl

and I run the 

m4 /etc/mail/sendmail.mc > /etc/mail/sendmail.cf

command and restarted sendmail with "service sendmail reload".

Now, I try command

sendmail -bv [email protected]

and I just get response: [email protected]... User unknown

The xxx-tele.com is appended in /etc/hosts and in /etc/mail/local-host-names

How can I setup sendmail to just forward this address and refuse all other?

The command: echo '$=w' | sendmail -bt just returns: 

ADDRESS TEST MODE (ruleset 3 NOT automatically invoked) 
Enter <ruleset> <address> 
> localhost.tele.com
web
xxx-tele.com
[internal.dmz.ip4.address]
localhost
web.tele.com
[127.0.0.1]
web.tele.com
[localhost.tele.com]

Best, dwi

here are the provided information: The answer for 1.) is

ADDRESS TEST MODE (ruleset 3 NOT automatically invoked) 
Enter <ruleset> <address>
 > map_lookup: virtuser ([email protected]) returns [email protected] (0)

The answer for 2.) is

ADDRESS TEST MODE (ruleset 3 NOT automatically invoked)
Enter <ruleset> <address>
> canonify input: info @ xxx-tele.com
Canonify2 input: info < @ xxx-tele.com >
map_lookup(host, xxx-tele.com, %0=xxx-tele.com) => localhost.xxx.com. (0)
Canonify2 returns: info < @ localhost.xxx.com . >
canonify returns: info < @ localhost.xxx.com . >
parse input: info < @ localhost.xxx.com . >
Parse0 input: info < @ localhost.xxx. com . >
map_lookup(dequote, info, %0=info) => NOT FOUND (0)
Parse0 returns: info < @ localhost.xxx.com . >
Parse1 input: info < @ localhost. xxx.com . >
map_lookup(virtuser, [email protected], %[email protected], %1=info) => NOT FOUND (0)
map_lookup(virtuser, @localhost.xxx.com, %[email protected], %1=info) => NOT FOUND (0)
Parse1 returns: $# local $: info
parse returns: $# local $: info

The third response is:

> root@web:~# _res.options = 812c3, HasWildcardMX = 0
Enter <ruleset> <address>
> canonify           input: info @ xxx-tele . com
Canonify2          input: info < @ xxx-tele . com >
Canonify2        returns: info < @ localhost . xxx. com . >
canonify         returns: info < @ localhost . xxx. com . >
parse              input: info < @ localhost . xxx. com . >
Parse0             input: info < @ localhost . xxx. com . >
Parse0           returns: info < @ localhost . xxx. com . >
Parse1             input: info < @ localhost . xxx. com . >
Parse1           returns: $# local $: info
parse            returns: $# local $: info

My host file is like:

127.0.0.1       localhost    localhost.xxx.com    xxx-tele.com
local.dmz.ip4.address      web.xxx.com     web    xxx-tele.com
sendmail

2 Answers

  1. Sendmail: debugging virtusertable

    1) Check if sendmailcan access the entry in virtusetable

    As root execute:

    echo /map virtuser [email protected]  | sendmail -bt

    2) Check if sendmail conducts virtusertable lookups for the email.
    As root execute:

    echo '3,0 [email protected]' | sendmail -d60.5 -bt

    -d60.5 traces (all) maps lookups including virtusertable lookups

    3) If the domain is rewritten by host map lookup before virtusertable lookups then check DNS lookups and post /etc/hots entries with xxx-tele.com

    echo '3,0 [email protected]' | sendmail -d8.20 -bt
    • 1
  2. Best Answer

    Domain gets rewritten by host map lookup before virtusertable lookup
    as indicated by debug output provided by 

    echo '3,0 [email protected]' | sendmail -d60.5 -bt

    Changing your /etc/hosts entry should fix it

    ### Old Entry
# 127.0.0.1       localhost    localhost.xxx.com    xxx-tele.com
### New Entry
127.0.0.1       localhost  xxx-tele.com
    • 1