How to reduce the numebr of nuisance landline calls

In our house we have subscribed to the “no-call list” – but we still seem to get a large number of telesales calls. And some calls with “unknown” pr “withheld” numbers that have called us at regular intervals during the night.

But as we use a Fritzbox to connect our wireless phones and other devices to the landline I set up the following rule on the Fritzbox

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Now all unknown calls go directly to the Fritzbox answering machine, and if they are “real” calls we assume they will leave a message so that we can call them back.

It works remarkably well.

BT infinity – challenges

When you run your own mail server on your own domain and move to BT Infinity there are a few possible issues

– BT does not offer static IP addresses for the non-business version of Infinity

A lot of recipient mail servers will refuse to receive email from mail servers with dynamic IP addresses, as their spemfilters rely on tracking known spammers by the IP addresses they use.

So you will have to use BT Internets “smart host” = mail.btinternet.com to relay your outgoing mail through.

If you (as I) use a Mac running OsX as a mail server running postfix, this will not work out of the box, as the authentication mechanism used is plain text.

So you need the line

smtpd_sasl_security_options = no anonymous

in your main configuration file for postfix (in /etc/postfix)

Spammers adapting shortened URLs

Groan – spam is mutating again :

Spammers using shortened URLs to spread their muck Message Labs – part of internet security guru Symantec – is warning that shortened URLs are becoming an issue in terms of spam. This graph shows how the inclusion of shortened URLs in spam email has increased from practically nothing a to almost 2% in just a few days: [From Spammers using shortened URLs to spread their muck]

ASSP spamfilter has some new capabilities

My favorite spamfilter – ASSP – has some new facilities in the latest version.

My favourite these days is the ability to send a email to the dummy address “asspblock” in the format “user@server=>receivinguser” sends you a detailed list of all emails for the particular user that have been blocked, and gives the receiving user the ability to forward these messages to the user…

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(Click for larger)