free barcode generator dll for vb.net s AUTHENTICATING AND SECURING YOUR MAIL in Font

Make Data Matrix ECC200 in Font s AUTHENTICATING AND SECURING YOUR MAIL

CHAPTER 8 s AUTHENTICATING AND SECURING YOUR MAIL
Create Data Matrix ECC200 In None
Using Barcode encoder for Font Control to generate, create Data Matrix ECC200 image in Font applications.
www.OnBarcode.com
Code128 Encoder In None
Using Barcode drawer for Font Control to generate, create Code 128A image in Font applications.
www.OnBarcode.com
For a TLS client, add the following lines in your main.cf file, again replacing /path/to/certs with the path to the location of your certificates (including your CA cert file) and replacing cert, key, and CAcert with the names of your certificate, key, and CA cert files in PEM format, respectively. smtp_tls_cert_file = /path/to/certs/cert.pem smtp_tls_key_file = /path/to/certs/key.pem smtp_tls_CAfile = /path/to/certs/CAcert.pem You can also add some other options that are useful. The first is logging. Add the following line to main.cf to enable logging for Postfix as a TSL server: smtpd_tls_loglevel = 1 You can also add the following for Postfix TLS client logging: smtp_tls_loglevel = 1 Five logging levels exist and are identical for both the server and client logging options. Table 8-2 details them. Table 8-2. TLS Logging levels for Postfix
EAN / UCC - 13 Creator In None
Using Barcode printer for Font Control to generate, create EAN 13 image in Font applications.
www.OnBarcode.com
Code 3 Of 9 Maker In None
Using Barcode maker for Font Control to generate, create Code 3/9 image in Font applications.
www.OnBarcode.com
Level
PDF417 Encoder In None
Using Barcode printer for Font Control to generate, create PDF417 image in Font applications.
www.OnBarcode.com
QR Code JIS X 0510 Generator In None
Using Barcode generation for Font Control to generate, create QR Code 2d barcode image in Font applications.
www.OnBarcode.com
0 1 2 3 4
Printing Data Matrix ECC200 In None
Using Barcode maker for Font Control to generate, create Data Matrix 2d barcode image in Font applications.
www.OnBarcode.com
MSI Plessey Maker In None
Using Barcode encoder for Font Control to generate, create MSI Plessey image in Font applications.
www.OnBarcode.com
Description
Data Matrix Encoder In None
Using Barcode printer for Online Control to generate, create ECC200 image in Online applications.
www.OnBarcode.com
Encoding Data Matrix In Java
Using Barcode maker for BIRT reports Control to generate, create Data Matrix ECC200 image in BIRT reports applications.
www.OnBarcode.com
No logging Startup and certificate information Level 1 plus display levels during negotiation Level 2 plus a HEX and ASCII dump of the negotiation process Level 3 plus a HEX and ASCII dump of the complete STARTTLS transaction
Print Barcode In Java
Using Barcode creation for Java Control to generate, create Barcode image in Java applications.
www.OnBarcode.com
Creating Code128 In .NET
Using Barcode encoder for Reporting Service Control to generate, create Code 128 Code Set B image in Reporting Service applications.
www.OnBarcode.com
I recommend during normal operations a logging level of 1 or 2. I recommend not using Level 4 unless you absolutely need this information for Postfix TLS client logging, as this will generate a huge volume of data and could considerably slow down your server. A useful option for server TLS is smtpd_tls_auth_only. This stops Postfix from sending AUTH data over an unencrypted channel. This is useful when you are also using SMTP AUTH. If this option is set to yes, then Postfix will send AUTH data only once TLS has been activated via the STARTTLS command. To enable this option, add the following to the main.cf file: smtpd_tls_auth_only = yes Finally, you need to add a line explicitly starting TLS to your main.cf file. For a Postfix acting as a TLS server, add the following: smtpd_use_tls = yes For Postfix acting as a TLS client, add the following: smtp_use_tls = yes After adding one or both options, you need to reload Postfix.
Decode QR In C#
Using Barcode scanner for Visual Studio .NET Control to read, scan read, scan image in Visual Studio .NET applications.
www.OnBarcode.com
PDF417 Scanner In .NET Framework
Using Barcode reader for .NET framework Control to read, scan read, scan image in .NET applications.
www.OnBarcode.com
CHAPTER 8 s AUTHENTICATING AND SECURING YOUR MAIL
Generate EAN 128 In VB.NET
Using Barcode printer for VS .NET Control to generate, create EAN / UCC - 13 image in VS .NET applications.
www.OnBarcode.com
Drawing Barcode In .NET
Using Barcode creation for ASP.NET Control to generate, create Barcode image in ASP.NET applications.
www.OnBarcode.com
Now when you Telnet to your Postfix server and issue the EHLO command, you should see STARTTLS as one of the available capabilities of your Postfix server. puppy# telnet puppy.yourdomain.com 25 Trying 192.168.0.1... Connected to puppy. Escape character is '^]'. 220 puppy.yourdomain.com EHLO kitten.yourdomain.com 250-puppy.yourdomain.com 250-STARTTLS You are now ready to use TLS with Postfix!
Data Matrix ECC200 Creation In Java
Using Barcode generation for Java Control to generate, create Data Matrix 2d barcode image in Java applications.
www.OnBarcode.com
PDF417 Reader In VB.NET
Using Barcode recognizer for .NET framework Control to read, scan read, scan image in VS .NET applications.
www.OnBarcode.com
s Note With Postfix-TLS you may want to investigate a few other options. The Postfix-TLS patch also comes with a sample configuration file that details all the options available. This usually located in /etc/postfix/sample-tls.cf.
Matrix 2D Barcode Creation In VB.NET
Using Barcode drawer for Visual Studio .NET Control to generate, create Matrix Barcode image in VS .NET applications.
www.OnBarcode.com
QR-Code Maker In .NET Framework
Using Barcode drawer for ASP.NET Control to generate, create QR image in ASP.NET applications.
www.OnBarcode.com
Using TLS for a Specific Host
As an example of how to use TLS with Postfix, I will take you through the process of enforcing the use of TLS for specific hosts or domains. I will do this by defining a new option, smtp_tls_per_site, in the main.cf file. This option will reference a list of hosts and domains and contain specific instructions that tell Postfix whether to use TLS with that host or domain. Remember to be careful. The host or domain you are sending to must be capable of TLS, and if you specify it must use TLS, then you need to be sure it has TLS capabilities; otherwise, you will not be able to send mail to that host or domain. As most systems on the Internet are not TLS capable, you should reserve this sort of enforcement for hosts and domains with which you were sure you are able to initiate TLS. To get started, add the following line to your main.cf file: smtp_tls_per_site = hash:/etc/postfix/tls_per_site The hash:/etc/postfix/tls_per_site entry refers to a Postfix hash map created with the postmap command that you will create shortly. Now you need to specify the hosts and domains that will or will not use TLS. Create a new file called tls_per_site, and add entries for all the hosts and systems you want to define. Each entry should consist of a hostname or domain name followed by a space or tab with each new host or domain on a new line. Listing 8-13 shows you how to do it. Listing 8-13. A Sample tls_per_site File puppy.yourdomain.com MUST yourdomain.com MAY otherdomain.com NONE anotherdomain.com MUST_NOPEERMATCH
Copyright © OnBarcode.com . All rights reserved.