I'm looking at Votiro, Proofpoint & Israel email security products
to reduce spam, emails from bad reputation IP, emails with
malicious attachments & URL.
What are the features/criteria to assess or look out for?
Esp if I'm on O365.
a) can link to SpamHaus, RBL etc to get bad reputation IP?
b) o
There is an external app server (that is our service provider) that we want
them
to blast emails to a team/department in our organization (email domain @
xyz.com)
but these emails will have the sender to be in same domain as us ie @xyz.com
.
What are the risks of permitting such bypass (ie disable
Thanks. I'm not sure if the product I uses ie ProofPoint could
do API integration to the list esp :
http://mxtoolbox.com/blacklists.aspx
In one forum that I join, E Exchange, I was told that usually these
providers (esp antivirus vendors) will not release their blacklists
because doing so will
This may have been raised before:
we received quite a few malicious emails (containing malicious attachments)
& on tracing the senders' IP (from the 'Internet Headers' of the received
mails) & key into one of the services below, noted they are malicious
& then we manually block them but by then a
Just a last post from me:
is there any chance that a whitelisted IP address (whitelisted on
our local email server for the remote to forward email to us as we
plan to permit Tcp25 incoming for this whitelisted IP while the
rest of the emails have to go to our ProofPoint) could have
been spoofed?
Point. Our local ProofPoint will only scan for
emails sent to us
addressed to a_u...@xxx.com.nz
On 7/28/16, Viktor Dukhovni wrote:
>
>> On Jul 27, 2016, at 11:24 PM, Roger Goh wrote:
>>
>> Can source (ie smtp.zzzbank.com.au & srvm02.zzzbank.com.au below)
>> &a
If the IP address is spoofed, how does firewall rejects it?
In the case of MS Exchange, will implementing something like
SPF (Sender Policy Framework) and Sender ID filtering help?
Sun
On Thu, Jul 28, 2016 at 11:48 AM, David Benfell wrote:
> On 07/27/2016 08:24 PM, Roger Goh wrote:
>
Our headquarter's email server auto-forward emails over to our
email server & I have a concern:
Can source (ie smtp.zzzbank.com.au & srvm02.zzzbank.com.au below)
& the IP addresses be spoofed?
Received: from smtp.zzzbank.com.au (10.98.2.87) by ZZZWVEXC01ZZ.bbb.com.au
(10.9.95.37) with z S
#x27;t comment on the support.
Roger
On Fri, Jan 23, 2015 at 11:23 PM, Viktor Dukhovni <
postfix-us...@dukhovni.org> wrote:
> On Fri, Jan 23, 2015 at 09:43:39PM +0800, Roger Goh wrote:
>
> > We are using a commercial version of sendmail (refer to sendmail.com)
> > on R
We are using a commercial version of sendmail (refer to sendmail.com)
on RHEL 5.x
We have seen something like 2 mails sent to it within 5 mins &
it just hung up or caused severe delay in delivery.
Q1:
Is postfix (which is now the default Smtp with RHEL 6.x) more robust ie can
take bursts of h
I have got the firewall rules permitted from our RHEL 5.x
& RHEL 6.x servers to our SMTP relay server (it runs
on RHEL 5.8).
In the past, I recall I have a server that I could just issue
mutt command below & it will send email out via the
relay server at that site:
mutt -s "Test mail" -a /tmp/file
>> Noel provided but sendmail.cf will need to be configured.
> ...why ?
> Are you using sendmail, or are you using postfix ?
I need to send mails out from an RHES4.x box (which does
not have Postfix installed & sendmail is not supposed to be
started as it's hardened for security reason). This box
Just to add, I'm not allowed to start up sendmail (as it's hardened
for security reason), so editing sendmail.cf may not be an option.
So I certainly need a script/tool to do this forwarding to the relay
/postfix server
Roger
On Tue, Nov 29, 2011 at 11:15 AM, Roger Goh wrote:
Yes, understand the syntax/example mutt & nail that Jeroen &
Noel provided but sendmail.cf will need to be configured.
I got the following script which someone has tested working
on his postfix but I have a problem with RCPT TO:
(need someone to tell me how to obtain a valid address for RCPT TO)
Quite desperate & sorry if this is OT.
I have a Linux RHES 4.5 box that's on the same subnet as my Postfix
box. For security reasons, I'm not allowed to ftp/scp/sftp files between
this box & the Postfix server.
I have the following Perl script which I wanted to use to mail (& attach
files) out t
All four of us (, , mmm, ppp) suddenly received a notification
email below:
An app from xxxportal.com's postfix server was sending an email to
all four of our mailboxes (in sss.com.au's mail server).
So is the notification below indicating we need to tune TLS at xxxportal.com's
postfix se
We host a portal for the citizens & as add-on value, we offer a
free mailbox service. Our marketing chaps blast marketing
mails to subscribers of our mail service (which is also owned by
us) so we're authorized to 'spam' marketing newsletters to those
who signed up with us. However, some subscrib
Thanks for the Perl script Wolfgang
> resource were exhausted, too many "MAILER-DAEMON" or tens of thousands
> of stuck mails due to invalid email address (as shown by mailq)
>> Then your configuration is partially or wholly incorrect.
Well, it's often triggered by our mail blasting team : it's
There could be various reasons why mails are not going out or
coming in & I have test scripts to send between my two postfix
servers; so why not monitor those test mails hourly?
There's often problem with our postfix mail server (that runs Cyrus /
Cyrus-imapd) :
I have scripts (using mutt) to send hourly mails out (& from another
postfix server, I
can send mails to it).
I need a way / method such that if those hourly test mails were never
sent out or
received, I'll need
If users send mails to abc@postfix_pop3.com, I don't get
this looping problem; it's only when they send mails to
abc@exchange_pop3.com.
Also, previously when POP3 was enabled on Exchange 2003
server & "auto-forwarding" was not set up on the Exchange
mailbox, I don't get this looping mails issue.
My apologies if this is not the right group to post but I'm
getting desperate.
Currently I have a mailbox (let's refer to it as abc@exchange_pop3.com)
hosted in our corporate IS MS Exchange server. This old Exchange 2003
server permits POP3 so that my CRM app can download mails from this
mailbox
& from the url Roger Klorese provided,
http://www.iss.net/security_center/reference/vuln/smtp-ehlo.htm
it says :
SMTP daemons that support Extended HELO (EHLO) can release information
that could be useful to an attacker in performing an attack. Attackers
have been known to use the EHLO command t
n in HELO or EHLO command or empty string
(& where & what's the syntax to set the above suggestions?)
Roger
On Tue, May 3, 2011 at 11:56 PM, Roger B.A. Klorese wrote:
>
> On May 3, 2011, at 8:49 AM, Reindl Harald wrote:
>
> Am 03.05.2011 17:34, schrieb Roger Goh:
>
>
1 more question:
if there's a way to disable EHLO or fixing it via a patch,
how do I verify (without running VA scan) that this EHLO
vulnerability has been fixed?
TIA
Roger
Hi,
During a VA scan, it's reported that my postfix server has
a security vulnerability :
EhloCheck: SMTP daemon supports EHLO
1. How can I disable EHLO & still send/receive mails?
2. Or is there a later version of postfix (let me know the
version) that addresses this or any patch to ap
1)What are the types of emails in postfix queue that would be set to
MAILER-DAEMON? Is it all undeliverable mails? Or we can add
in extra criteria to set incoming mails to MAILER-DAEMON (& how)?
2)I think it takes several hours currently to set undeliverable mails to
MAILER-DAEMON. Wher
Thanks Noel.
Further assistance needed:
> The message means what it says. You have specified SASL auth, but postfix
> was not compiled with SASL support. Recompile postfix with SASL or if
> you're using packages find a package that has SASL support.
Would you be able to point me to a link that
Bear with me; I'm a newbie struggling to get a newly set up postfix
server to receive mails on Unix account (roger8 is the account that
I've useradd'ed)
1. firstly, is ISPconfig necessary in a postfix server or I can still get
a basic postfix set up without it? If it's essential where can I
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