Keeping known email abusers out is always desired. Postfix has a parameter which is specified in the main.cf file that allows you to refer to these lists.
The script I use is as follows…
smtpd_client_restrictions =
permit_mynetworks
permit_sasl_authenticated
reject_unauth_pipelining
reject_rbl_client cbl.abuseat.org
reject_rbl_client dnsbl.ahbl.org
reject_rbl_client dnsbl.sorbs.net
reject_rbl_client list.dsbl.org
reject_rbl_client sbl-xbl.spamhaus.org
#reject_rhsbl_client blackhole.securitysage.com
reject_rhsbl_client rhsbl.sorbs.net
permit
Note the commented out line
#reject_rhsbl_client blackhole.securitysage.com
See below
Sponsored Links
This is a list that was not properly [...]
Posted in:
Business, linux, networking, smtp
by
Julian Perry
/
Tags: ahbl, Business, cf, google, julian perry, mta, networking, Postfix, smtp, spamhaus
6 Comments
See below
Sponsored Links
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Mbit
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20
2,560
16
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1,024
4
512
2
256
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128
0.5
64
Posted in:
Linux & Windows
by
Julian Perry
/
Tags: bandwidth, conversion, google, ks, mbit
2 Comments
So you have your linux server up and running. A lot of time and effort went into this so lets get it backed up. You don’t need to invest in any fancy backup system. A bit of shell script and some use of crontab will do the trick.
Here are the two scripts I use…
Email backup
Create [...]
Posted in:
Business, networking, server, software
by
Julian Perry
/
Tags: apps, backup, backup mail server, backup system, backup web, Business, databases, executable file, google, httpd, linux, linux server, mail web, networking, scripts, server, server apps, shell script, web backup, web sql
2 Comments
Very often it is necessary to test that your SMTP server is working.
The easiest way to do this is with the telnet command.
This lets you talk directly to the email server in its own SMTP protocol script language.
Here’s how…
telnet server name or IP address 25
HELO aaaa
mail from: <tom@fromdomain.com>
rcpt to: <fred@todomain.com>
data
Enter your message text
.
quit
Along the way [...]
Posted in:
Business, email, networking, smtp
by
Julian Perry
/
Tags: Business, email, email server, google, host telnet, ip address, mail, networking, rcpt, server, server name, smtp, smtp protocol, smtp server, telnet, telnet command
8 Comments
This is an SMTP server like the one your ISP provides. It is targeted at Windows users and sells as a faster and more flexible alternative.
I don’t like to be negative about the efforts of others but, I do find it diffucult to see what advantage this server application gives you over the already available [...]
Posted in:
Business, email, networking, server, smtp, windows
by
Julian Perry
/
Tags: Business, control panel, delivery times, email, email client, email delivery, email messages, iis, internet information services, isp, networking, party pooper, postcast, postcast server, quantities, server, server application, server component, smtp, smtp component, smtp server, windows components, windows users, windows xp
No Comments
There are a huge range of email server products available.
I won’t beat around the bush, in my honest opinion, most Postfix based systems are by far the most practical and effective. The main reason for this is that Postfix is free and flexible.
A fantastic, sophisticated and clever email server software system is the Zimbra Collaboration [...]
Posted in:
Business, email, networking, server, software
by
Julian Perry
/
Tags: bind, Business, dns, dns server, email, email server software, honest opinion, networking, open source edition, server, server products, software, software system, zimbra collaboration suite
6 Comments
Discovered something unexpected and annoying.
I recently installed an office VoIP system using 3CX and a mix of X-Lite and 3CX client apps. To cut a long story short, I sorted the bandwidth issue but two desktops continued to have issues. This was perplexing and rather annoying as one was the IT Director’s.
Convinced there was still [...]
Posted in:
Business, networking, windows
by
Julian Perry
/
Tags: 3cx, bandwidth issue, bandwidth problem, blip, Business, business pc, client, connectivity problems, data flow, data packets, desktops, network cable, network clients, networking, onboard sound, pc hardware, stable, unexpected behaviour, voip, wall socket, web email, windows
1 Comment