email

Today I sent an email to a person with an attachment that was not supposed to be sent, so I had to log into my postfix server and delete it from the queue before it leaves the server.

Fortunately, I realized before it leaves, and thanks God the email was big enough for me to have time to log in, find the message and delete it.

If you ever need to delete an email from Postfix queue, you have to follow this steps.

Once logged in your server find the message you are looking for.

sudo postqueue -p

This how-to shows you an easy way to backup and then restore your thunderbird data including your emails

It is a good idea to backup from time to time your data, and maybe some of our most valuable data now a days are our emails, and email addresses.

And yes there are a lot of on-line applications that may take care about that, like plaxo or gmail I prefer to have all that in my PC with my favorite email client which is Thunderbird

Today I will show you which steps you need to backup and then restore to the same machine or to another one your Thunderbird data.

In some countries, or better said some ISP have started to block port 25 to avoid PC viruses to send copies of themselves by email to all the contacts on you address book.

Well this could be good if you use your ISP smtp server to send email, but what happens if you use your office server, or you are in business trip, and get to a Hotel where you cannot send email through your smtp server because the port 25 is blocked, and you can't use the ISP smtp server because you do not have an account with them.

An approach lots of systems administrators are taking is to use port 26, so you can configure your email client and your colleagues email's clients to use port 26 instead of 25 to send emails.

Here I will show you how to configure your smtp server to accept email connections on port 26, independent of the server you are using, Postfix, or Sendmail or any other server.

This will describe you how to set up a smarthost using either sendmail or exim, for the exim,
i will only consider Debian.

This is to send emails using your linux server as your smtp server, and it will use your ISP email server to send all your emails through it, to the final users.

The sendmail configuration I have tested on CentOS, and Fedora, but should work on Debian
and Ubuntu as well