similar to: Hosted SMTP Server Recommendation?

I am used to sendmail and am using Postfix now and am uncertain of some features. I typically would comment out the line in sendmail.mc that went something like 'accept unresolvable domains' I tried using smtpd_sender_restrictions = reject_unverified_sender reject_unverified_smtp and this seems a bit too restrictive and got some bounces on legitimate senders so I'm

Is there a way to listen on port 25 for repeated dictionary attacks to harvest email address and blacklist that Ip with shorewall? Thanks, Mike

To whom it may concern I tried to register, but I received no email. Tried anther email address - again no email. In both cases the wine forum sys had registered me, but without the confirmation email, I couldn't get on. I then created a yahoo web email - and this worked. So the sys can send to web accounts but evidently not to pop accounts.

Hi, Some people have suggested maintaining black lists and white lists to avoid spammers and allow legitimate callers into the network. However, the problem with this method is that the spammer's IP address might change due to DHCP. Today a spammer might get aaa.bbb.ccc.ddd and lets say that I put this address in my blacklist. To my annoyance, tomorrow a legitimate caller might get

Hi list, I have the following problem: my boss and some other people on my lan want to use their ISP smtp to send mail when they connect from work lan, but, of course, their ISP smtp don''t allow relay when they aren''t at home. You can image my networks so: eth0 internet public ip eth1 local1 10.88.11.0/24 eth2 local2

On Fri, Feb 13, 2015 at 12:45 PM, Valeri Galtsev <galtsev at kicp.uchicago.edu> wrote: > >>> >> In this case the secondary MX has the same RBL's etc etc as the primary. >> I do see the spammers sending their junk to the secondary more than the >> primary MX. Agree the secondary does not know the difference between >> valid and invalid addresses. >

Dear Community Friends Greetings, i work with ISP, we host email service for almost 500+ companies and 200+ mail servers relay through my smart host. i implemented something that when our smart host would become blacklisted. It will automatic switch to next available smart host (which is ready sitting). that mean it will start relaying message through another smart host automatically. i think i

Les Mikesell wrote: > On Fri, Feb 13, 2015 at 11:39 AM, Valeri Galtsev > <galtsev at kicp.uchicago.edu> wrote: >>> Otherwise it accept junk that your primary rejects >> Not exactly. If greylisting on primary is set, but on backup MX is not, >> still what is killed by greylisting by primary MX, almost never will come >> through backup MX. This is due to the

On Fri, February 13, 2015 11:52 am, Les Mikesell wrote: > On Fri, Feb 13, 2015 at 11:39 AM, Valeri Galtsev > <galtsev at kicp.uchicago.edu> wrote: >> >>> Otherwise it accept junk that your primary rejects >> >> Not exactly. If greylisting on primary is set, but on backup MX is not, >> still what is killed by greylisting by primary MX, almost never

Over the weekend one of our servers at a remote location was hammered by an IP originating in mainland China. This attack was only noteworthy in that it attempted to connect to our pop3 service. We have long had an IP throttle on ssh connections to discourage this sort of thing. But I had not considered the possibility that other services were equally at risk. Researching this on the web does

Hi All, I'm just wanting to check that my understanding of the settings is correct as my web searches are finding a lot of dated information. If I want a Centos 6 sendmail system act as the secondary MX for domain bbbbb.co.uk do I just add a Connect:bbbbb.co.uk RELAY statement into /etc/mail/access and restart sendmail Obviously I have the DNS MX records for the domain are

I read several posts about SMTP being blocked at ISP. My ISP has the same limitation. My ADSL connection (1 fixed IP) only permits outbound connection to port 25 to their server. None of those posts answered my need. I tried FAQ also. I have several internal email clients/bots that needs to retrieve/send messages, some of then are notebooks. It''s not fair to change SMTP server to the

Hi, I'm not sure what the policy of this list is and I bet everyone has a spam filter, so nobody might have noticed, but we got spammed. Can anyone send mail to the list or do you have to subscribe first ? -- dag wieers, dag@wieers.com, http://dag.wieers.com/ -- [all I want is a warm bed and a kind word and unlimited power]

Just been contacted by a UK Enum registrar looking for ITSPs to become resellers of their Enum registration systems ... Is anyone using Enum? Does anyone (other than cynical old me) think that Enum is a spammers best friend? Has anyone received a spam VoIP call yet? (ie. one placed directly over the Internet aimed at a SIP URI to a PBX which allows anonymous incoming calls?) I can see that

Many of you are interested in and have used or recommended fail2ban for your linux boxes. I finally installed it on our FreeBSD server (no asterisk, hence the OT) with the help of a friend from the VoIP Users Conference and Asterisk community. After a lot of new learning about regex, I extended the actions and filters to look at our mail server, plagued by spammers - who isn't? Our server has

Why are you replacing known spammers with these "banned" strings ? This forbids anti-spam filters & programs to do their jobs properly.

I got some weird mail back, claiming that my e-mail was blocked, w/o indicating what server was blocked, after the mail appeared in the mailing list. Is this some BS shakedown? I use postfix on a DSL line forwarding to earthlink, this is hardly something that should be rare in the BSD world... the mail appeared to come from a web mail server and the first link has the following lovely text:

On Sat, May 18, 2002 at 11:08:08PM +0300, Gavin White wrote: > > Because the aren't many users here, the list is not monitored, > no rules... I guess IceCast as not as big as I thought... and > infested by bunch of lamers that like to take advantage of it > to advertise. > Since it is Sunday and I am in a good mood, I will presume from your languague and attitude that you

A relatively recent development that spammers got wind of is users that have username==password, with/without the domain. I am tracking numerous 1-off attempts from bots to gain access to mailboxes this way. Situation isn't made any better if you're also using dovecot as SMTP AUTH provider for I am ashamed to admit I've relayed some spam that way. Would it be possible to deny login

I have a virus and spam filter device that can do VRFY commands to reject invalid email before it gets to the next mail hop. How can I configure the SMTP server to only allow VRFY commands from one particular IP address, and nowhere else? I don't want spammers to be able to hammer on the gateway looking for valid addresses to send to.