What if I set Mail Relay off ?

[kadoudal]

Currently we have the standard Mail Relay with authentication... , when Mail Relay is Off , Still anyone from the company with our domain addresses will be able to send email via the SMTP ? or does it suppress it ?
I did not pick it up right in my mind ....

thanks for some enlightments ..

 

[GeertL]

In control panel under Settings -> Mail Server Settings -> Relaying - you have:

Relaying	
 (*) closed
 ( ) authorization is required:
    [ ] POP3 before SMTP  lock time    Min
    [ ] SMTP

If people with a mail account at your server needs to be able to relay through your server - you need to choose the "authorization is required:" setting and the choose the two ways to open up the relay - by creating a POP3 auth or a SMTP auth (or both).

The POP3 auth method will create a record for (lock time minutes) where the IP the mail account user used a POP3 login from will be allowed to relay (send) mails through your server.

The SMTP will not require the mail account user to first login using POP3 (if in example its a IMAP user) but require the mail account user to setup SMTP AUTH in his/her mail client. (with login credentials the same as the mail account).

This way will enable your legitimate mail account users to still relay (send) mail through your server.

EDIT:
If set to Closed - no one will be able to relay through your server - except mails coming locally from the server itself.

(ie. local webmail on server, local scripts, system mails from the server it self etc.)


Hope this helps?

--
Kind regards
Geert Lund,
www.GLD.dk

 

[kadoudal]

Thanks a lot ... very helpful
you stated :

If set to Closed - no one will be able to relay through your server - except mails coming locally from the server itself.

This way will enable your legitimate mail account users to still relay (send) mail through your server.

Do you mean that even "if set to closed" , our user will be able to send email from their client mail app (Outlook, Mac mail app, ..) configured mailbox ?

 

[GeertL]

No, Im so sorry - the two sentenses was switched around when I posted ... I just reedited my post.

If set to Closed - no one will be able to use your server to relay mails through SMTP (but a local application/PHP script/ webmail etc. running on the server might still send mail).

And server still accepts mail for local users.

--
Kind regards
Geert Lund,
www.GLD.dk

 

[kadoudal]

OK thanks .. it's clear now I keep it open..
Now, to avoid the following issue, should I install SpamAssassin ?
--
a spammer ( [email protected] ) sent an email to one of our generic addresses ( [email protected])
qmail-queue-handlers is then relaying the spam to our employees ( [email protected] )..

here is the log -
qmail-queue-handlers[30755]: Handlers Filter before-queue for qmail started ...
qmail-queue-handlers[30755]: from=qmail-queue-handlers[30755]: Handlers Filter before-queue for qmail started ...
qmail-queue-handlers[30755]: [email protected]
qmail-queue-handlers[30755]: [email protected]
qmail: 1302831436.714827 new msg 6603912
qmail: 1302831436.714857 info msg 6603912: bytes 2723 from <[email protected]> qp 30756 uid 2020
qmail: 1302831436.717172 starting delivery 169: msg 6603912 to local [email protected]
qmail: 1302831436.717195 status: local 1/10 remote 0/20
qmail-local-handlers[30757]: Handlers Filter before-local for qmail started ...
qmail-local-handlers[30757]: [email protected]
qmail-local-handlers[30757]: [email protected]
qmail-local-handlers[30757]: mailbox: /var/qmail/mailnames/ourdomain.co.uk/info
qmail-queue-handlers[30760]: Handlers Filter before-queue for qmail started ...
qmail-queue-handlers[30760]: [email protected]
qmail-queue-handlers[30760]: [email protected]
qmail: 1302831436.737236 new msg 6603925
qmail: 1302831436.737266 info msg 6603925: bytes 2837 from <[email protected]> qp 30761 uid 110
qmail: 1302831436.743625 starting delivery 170: msg 6603925 to local [email protected]
qmail: 1302831436.743649 status: local 2/10 remote 0/20
qmail: 1302831436.743664 delivery 169: success: did_0+1+2/qp_30760/
qmail: 1302831436.743750 status: local 1/10 remote 0/20
qmail: 1302831436.743771 end msg 6603912
qmail-local-handlers[30762]: Handlers Filter before-local for qmail started ...
qmail-local-handlers[30762]: [email protected]
qmail-local-handlers[30762]: [email protected]
qmail-local-handlers[30762]: mailbox: /var/qmail/mailnames/ourdomain.co.uk/john.doe
qmail: 1302831436.749384 delivery 170: success: did_0+0+2/
qmail: 1302831436.749524 status: local 0/10 remote 0/20
qmail: 1302831436.749541 end msg 6603925
qmail-queue-handlers[30755]: [email protected]
qmail: 1302831436.714827 new msg 6603912
qmail: 1302831436.714857 info msg 6603912: bytes 2723 from <[email protected]> qp 30756 uid 2020
qmail: 1302831436.717172 starting delivery 169: msg 6603912 to local [email protected]
qmail: 1302831436.717195 status: local 1/10 remote 0/20
qmail-local-handlers[30757]: Handlers Filter before-local for qmail started ...
qmail-local-handlers[30757]: [email protected]
qmail-local-handlers[30757]: [email protected]
qmail-local-handlers[30757]: mailbox: /var/qmail/mailnames/ourdomain.co.uk/info
qmail-queue-handlers[30760]: Handlers Filter before-queue for qmail started ...
qmail-queue-handlers[30760]: [email protected]
qmail-queue-handlers[30760]: [email protected]
qmail: 1302831436.737236 new msg 6603925
qmail: 1302831436.737266 info msg 6603925: bytes 2837 from <[email protected]> qp 30761 uid 110
qmail: 1302831436.743625 starting delivery 170: msg 6603925 to local [email protected]
qmail: 1302831436.743649 status: local 2/10 remote 0/20
qmail: 1302831436.743664 delivery 169: success: did_0+1+2/qp_30760/
qmail: 1302831436.743750 status: local 1/10 remote 0/20
qmail: 1302831436.743771 end msg 6603912
qmail-local-handlers[30762]: Handlers Filter before-local for qmail started ...
qmail-local-handlers[30762]: [email protected]
qmail-local-handlers[30762]: [email protected]
qmail-local-handlers[30762]: mailbox: /var/qmail/mailnames/ourdomain.co.uk/john.doe
qmail: 1302831436.749384 delivery 170: success: did_0+0+2/
qmail: 1302831436.749524 status: local 0/10 remote 0/20
qmail: 1302831436.749541 end msg 6603925