similar to: Being attacked by an Amazon EC2

after having my own dnsbl feeded by a honeypot and even mod_security supports it for webservers i think dovecot sould support the same to prevent dictionary attacks from known bad hosts, in our case that blacklist is 100% trustable and blocks before SMTP-Auth while normal RBL's are after SASL i admit that i am not a C/C++-programmer, but i think doing the DNS request and in case it has a

I realize this is slightly off topic, but I've noticed recently that I've been unable to preform RBL lookups using the the zen and sbl spamhaus RBL lists. Currently using Zimbra Collaboration Suite using CentOS 5 I'm seeing logs showing the following output. [root at phantom ~]# cat /var/log/zimbra.log | grep spamhaus Jul 18 13:07:12 phantom postfix/smtpd[27001]: warning:

Am 17.06.2019 um 16:50 schrieb Bowie Bailey: > On 6/17/2019 6:20 AM, Nicolas Kovacs wrote: >> Hi, >> >> I'm managing several mail servers running CentOS 7, Postfix and Dovecot. >> SpamAssassin is filtering mail nicely, but I'm considering using RBL >> (blacklists) to take some load off the servers. >> >> General question to those of you who use

Hi i want to fetchmail from a pop server and check every email to any rbl spamhaus,spamcop,etc and if match at any rbl the email will be deleted. It's possible to do this? Thanks Nightduke

My apologies if I'm posting the wrong place, or am asking a common question. All my looking so far hasn't turned up anything very useful in knowing what to look at, or what to modify. --- CentOS 5, running BIND 9.3.6 i386 Hardware: P4, 2.8Ghz, 1G memory Sata drives - non mirrored etc. Load is light, usually under 0.1 -- This box is running Postfix as our mail server. BIND (9.3.6)

On 03/03/2015 11:03 PM, Earl Killian wrote: > On 2015/3/2 10:03, Reindl Harald wrote: >> >> that is all nice >> >> but the main benefit of RBL's is always ignored: >> >> * centralized >> * no log parsing at all >> * honeypot data are "delivered" to any host >> * it's cheap >> * it's easy to maintain >> * it

Hey Ned, I found this very useful to test that the RBL was working: http://www.spamhaus.org/faq/answers.lasso?section=Spamhaus%20SBL#207 " How do I test my SBL setup? Once you have set up your mail server to use sbl.spamhaus.org (or the preferred zen.spamhaus.org), you can test to see if the SBL blocking is working by sending an email (any email) to: nelson-sbl-test at crynwr.com

hi all I've been reading this thread with interest. As a rather novice programmer. I'm not being humble here, I really am not very good, I can do stuff, but it takes a LONG time. My spaghetti code even has meatballs in it ! Not being a great programmer I'm not really able to code something up, but it occurred to me something could be scripted, are the other posters suggesting

On 4/19/20 10:36 AM, Tim Evans wrote: > On 4/19/20 12:28 PM, S.Bob wrote: >> All; >> >> >> I installed sendmail via yum, but if I test it like this: >> >> > >> The original message was received at Sun, 19 Apr 2020 10:02:56 -0600 >> from localhost [127.0.0.1] >> >> ??? ----- The following addresses had permanent fatal errors -----

Dear Friend, I done configuration using RBLSMTPD with WHITELIST, but I don't know it is correct. Please check files below are corrects. Thanks Adriano === FILE WHITELIST.DOMINIO.RBL. ==== $ttl 900 whitelist.dominio.rbl. IN SOA host1.xxxxxx.com. root.xxxxx.com. ( 2006112002 ; serial; 3600 ; refresh period (1 hora); 900 ; retry time (15 minutos); 1800 ; expire tiem (30 minutos); 900 ;

Am 02.03.2015 um 18:56 schrieb Robert Schetterer: > perhaps and i mean really "perhaps" go this way > > https://sys4.de/de/blog/2014/03/27/fighting-smtp-auth-brute-force-attacks/ > > https://sys4.de/de/blog/2012/12/28/botnets-mit-rsyslog-und-iptables-recent-modul-abwehren/ > > 45K+ IPs will work in a recent table > i have them too but for smtp only like > >

Hi, I'm managing several mail servers running CentOS 7, Postfix and Dovecot. SpamAssassin is filtering mail nicely, but I'm considering using RBL (blacklists) to take some load off the servers. General question to those of you who use RBL. Which lists do you recommend using? Cheers, Niki -- Microlinux - Solutions informatiques durables 7, place de l'?glise - 30730 Montpezat Site :

Just a "heads-up" ... my home asterisk server is being flooded by someone from IP 184.73.17.150 which is an Amazon EC2 instance by the looks of it - they're trying to send SIP subscribes to one account - and they're flooding the requests in - it's averaging some 600Kbits/sec of incoming UDP data or about 200 a second )-: This is much worse than anything else I've

All; I installed sendmail via yum, but if I test it like this: echo "Subject: sendmail test" | sendmail sbob at quadratum-braccas.com I get a local mail on the server with this every time: Message? 1: From MAILER-DAEMON at kdb-bugs.example.com? Sun Apr 19 10:15:00 2020 Return-Path: <MAILER-DAEMON at kdb-bugs.example.com> Date: Sun, 19 Apr 2020 10:15:00 -0600 From: Mail

> -----Original Message----- > From: Tim Evans > Sent: Sunday, April 19, 2020 12:50 PM > > On 4/19/20 12:38 PM, S.Bob wrote: > > > > On 4/19/20 10:36 AM, Tim Evans wrote: > >> On 4/19/20 12:28 PM, S.Bob wrote: > >>> All; > >>> > >>> > >>> I installed sendmail via yum, but if I test it like this: > >>>

I've been running sendmail since the beginning of my online time. 1. Did I see that postfix can run sendmail milters? 2. If so, did I read that postfix can run these separately for inbound vs. outbound? 3. Can it run like a rbl blacklist on inbound and not outbound? 4. If the above is true, does this require separate configurations of postfix or is it already set to allow this out of the

> -----Original Message----- > From: S.Bob > Sent: Sunday, April 19, 2020 2:26 PM > To: centos at centos.org > Subject: Re: [CentOS] [Off topic] sending mail from Comcast was: Sendmail not working > > I followed this guide: > > > https://pepipost.com/tutorials/install-sendmail-server-centos-7/ Sigh - bad examples for you.... undo if you can. Postfix provides the

In the past I've used a combination of spamhaus combined RBL's and Spamassassin with Mailscanner as my spam recipe, but this stopped working very well for me well over a year ago. As many of the users of the couple small/personal mail servers I run are NOT technical people, and use POP to read their mail, 'training' spamassassin is difficult at best. Once upon a time, using

See other thread/reply. > -----Original Message----- > From: CentOS <centos-bounces at centos.org> On Behalf Of S.Bob > Sent: Sunday, April 19, 2020 3:11 PM > To: centos at centos.org > Subject: Re: [CentOS] [Off topic] sending mail from Comcast was: Sendmail not working > > OK, I've fired up a new VM, new CentOS 7 install, now I get this: > > # rpm -qf

IMO, First secure your entry points.. Mail webserver and proxy and the exit points. ( your users environment in my case windows 7/10 desktops.) Im waiting until trevor has the antivirus vfs is ready for samba 4. @David Disseldrop, you know the status about that, since it was you call to get it in samba. ;-) (https://github.com/fumiyas/samba-virusfilter/issues/23) I've seen good work but