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Postings by Roberto Carna

Postfix with DKIM for a mail relay

Dear, my domain is "example.com".

My cooperative mail server is an Exchange which does not implement DKIM at
all.

But also I have a Postfix mail relay for the "example.com" domain.

Is it possible to implement DKIM only in my Postfix server for all the
outgoing @example.com mails ??? Or doing this I affect the outgoing mails
from my Exchange server because it sends @example.com mails withouth DKIM
mechanism ???

Thanks a lot !!!

Robert

Is this behavior an open relay or not ?

Hi people, suppose my domain is "company.com".

My email users are as this: <a href="mailto: ... at company dot com"> ... at company dot com</a>

Is normal that I can send a mail from <a href="mailto: ... at company dot com"> ... at company dot com</a> to
<a href="mailto: ... at company dot com"> ... at company dot com</a>, from a public IP not belonging to my company?

In my case, I am at home and I execute:

$ telnet smtp.company.com 25
ehlo company.com
mail from: <a href="mailto: ... at company dot com"> ... at company dot com</a>
rcpt to: ... at company dot com
data
test
.

and finally the message arrives to may Inbox.

Because I suppose that the normal behavior is sending mail from local
address just from an internal IP...not from external.

Thanks a lot, regards!!!

Zimbra Red Hat repositories

People, I want to add the Zimbra repositories to my current Red Hat
server, and I can't find them anywhere.

Please can you give me the offcial Zimbra repos for Red Hat?

Special thanks

Mail queue with 110.000 mails

Dear, yesterday I realized that the mail queue of my SMTP relay server
is about 110.000 mails, and the warning log file tell me:

Mar 20 10:00:08 RELAY1 postfix/qmgr[55666]: warning: mail for
[10.0.0.1] is using up 20000 of 20000 active queue entries

Mar 20 10:00:09 RELAY1 postfix/qmgr[55666]: warning: you may need to
increase the main.cf smtp_destination_concurrency_limit from 20

Mar 20 10:00:10 RELAY1 postfix/qmgr[55666]: warning: please avoid
flushing the whole queue when you have

Mar 20 10:00:10 RELAY1 postfix/qmgr[55666]: warning: lots of deferred
mail, that is bad for performance

Mar