Hello people,
I'm using exim 4.96 from Debian bookworm.
I have some questions regarding verifying local virtual users before
deliverying messages.
This is my local_user router:
local_user:
debug_print = "R: local_user for $local_part@$domain"
driver = accept
domains = +local_domains
# check_local_user
local_parts = ! root
condition = ${lookup{$local_part@$domain}dsearch{/srv/vmail}}
transport = dovecot_lda
cannot_route_message = Unknown user
I did comment check_local_user because there are no system users, only virtual
users defined in a mysql database, used in conjunction with dovecot to
authenticate. The 'condition' directive will check the existence of a directory
in /srv/vmail whose name is the email address and that's the Maildir base
directory. If this directory exists, the email account exists. It does the job
but I would like to be sure if this rule is OK.
- It is a good idea checking sender this way?
- Would be better checking in a file with lsearch? i.e.
/etc/exim4/email_addresses which contains all virtual users email addresses?
- What about checking a MySQL table the existence of virtual users? Such table
exists because is the table used by the dovecot authenticator. How can this
check be coded?
- When the text 'Unknown user' on directive 'cannot_route_message' is sent on SMTP
session? when the check fails, the messages are550-Verification failed for <...>
550-Unrouteable address 550 Sender verification failed".
I'm using the following transport:
dovecot_lda:
driver = lmtp
socket = /var/run/dovecot/lmtp
delivery_date_add
envelope_to_add
return_path_add
user = vmail
group = vmail
Thanks in advance for any help
Emilio
--
Emilio Augusto Lazo Zaia
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