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I need to set up a mail server config for a test environment which would accept all mail (i.e. for all users and all domains, even non-local ones) and put it into a single local catchall mailbox.

What I have is SLES 11 with Sendmail (8.14) where I tried modifying /etc/mail/virtusertable to look like

@ catchall

or like

@* catchall

but to no avail - destination mail addresses (e.g. "santa@northpole.org") are not rewritten to catchall@, so delivery is tried to the appropriate MX:

# sendmail -bt
ADDRESS TEST MODE (ruleset 3 NOT automatically invoked)
Enter <ruleset> <address>
> 3,0 santa@northpole.org
canonify           input: santa @ northpole . org
Canonify2          input: santa < @ northpole . org >
Canonify2        returns: santa < @ northpole . org . >
canonify         returns: santa < @ northpole . org . >
parse              input: santa < @ northpole . org . >
Parse0             input: santa < @ northpole . org . >
Parse0           returns: santa < @ northpole . org . >
ParseLocal         input: santa < @ northpole . org . >
ParseLocal       returns: santa < @ northpole . org . >
Parse1             input: santa < @ northpole . org . >
MailerToTriple     input: < > santa < @ northpole . org . >
MailerToTriple   returns: santa < @ northpole . org . >
Parse1           returns: $# esmtp $@ northpole . org . $: santa < @ northpole . org . >
parse            returns: $# esmtp $@ northpole . org . $: santa < @ northpole . org . >

It seems like wildcards are not supported in the source domain part of the lookup table.

How would I implement this with Sendmail?

Edit: As per Andrzej's comments I have tried a mailertable entry of 

. local:catch-all-outgoing

as well as 

.. local:catch-all-outgoing

and received identical output for sendmail -bv in both cases:

# sendmail -d60.5 -bv jd@example.net
map_lookup(dequote, root, %0=root) => NOT FOUND (0)
map_lookup(host, example.net, %0=example.net) => example.net. (0)
jd@example.net... deliverable: mailer esmtp, host example.net., user jd@example.net

(yes, root, as sendmail seems unable to run as non-root)

Edit: it turned out, the mailertable feature has not been enabled in the macro file, thus sendmail.cf did not contain the appropriate rewrite rules for it to work.

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the-wabbit
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2 Answers2

2

What you are running into here: /etc/mail/virtusertable I believe is limited to inbound email only, not outbound.

You can use default route in mailertable or SMART_HOST to deliver all non local messages to one local mailbox/alias.

mailertable entry:
. local:catch-all-outgoing

aliases:
catch-all-outgoing: some-local-account

Any LHS entry that does not begin with a dot matches the full host name indicated. LHS entries beginning with a dot match anything ending with that domain name (including the leading dot) -- that is, they can be thought of as having a leading ".+" regular expression pattern for a non-empty sequence of characters.

The RHS should always be a "mailer:host" pair. The mailer is the configuration name of a mailer (that is, an M line in the sendmail.cf file). The "host" will be the hostname passed to that mailer.

(reference: sendmail readme, "USING MAILERTABLES" section)

So something like:

. local:catch-all-outgoing (just a single dot as per Adrzej's comment) in /etc/mail/mailertable should cause any domain.tld to redirect to the local mailer config defined in sendmail.cf. With the alias catching the hostname of catch-all-outgoing and causing it to be a local email address.

For the mailertable to work, it needs to be enabled in the config. Adding

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

to the m4 macro file generating your config should take care of that.

Also from the sendmail site help files:

MAILERTABLE:

Include a "mailer table" which can be used to override routing for particular domains (which are not in class {w}, i.e. local host names). The argument of the FEATURE may be the key definition. If none is specified, the definition used is:

hash /etc/mail/mailertable

Keys in this database are fully qualified domain names or partial domains preceded by a dot -- for example, "vangogh.CS.Berkeley.EDU" or ".CS.Berkeley.EDU". As a special case of the latter, "." matches any domain not covered by other keys. Values must be of the form: mailer:domain

where "mailer" is the internal mailer name, and "domain" is where to send the message. These maps are not reflected into the message header. As a special case, the forms: local:user will forward to the indicated user using the local mailer,

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TheCleaner
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1

Sendmail: catchall for local and non local adressess

You may define SMART_HOST for non local domains and MAIl_HUB for local email domains.

sendmail.mc:

define(`SMART_HOST',`local:some_existing_user')dnl
define(`MAIL_HUB',`local:some_existing_user')dnl
dnl optional part to list local users/mailboxes excluded from the redirect
dnl in /etc/mail/direct-users file (one user per line)
LOCAL_CONFIG
FL/etc/mail/direct-users
divert(0)

P.S.

Use echo '$=w' | sendmail -bt to get list of local email domains. Sendmail by default fills it auto-magically.

mailertable may be used to exclude some external domain from the redirect

example.net %0
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