create 2d barcode c# Part IV in C#

Generation ECC200 in C# Part IV

Part IV
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Performing Advanced Tasks
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verified, known spam sources to those that are quite aggressive at deciding who and what is spam. Which type of list you choose will have a lot to do with how tolerant you are of false positives. One list of block lists you can start with is http://www.email-policy.com/Spam-black-lists.htm. Another useful resource is a list of resources related to spam and block lists: http://dmoz.org /Computers/Internet/Abuse/Spam/Blacklists/. A word of caution, however: using an RBL means that you are trusting someone else to make the decisions about what e-mail you will receive and what e-mail you will block. There are inherent problems with this approach, but it does make your decisions easier. If you do use an RBL, you should probably archive blocked messages to make sure you re not inadvertently blocking something you really want. But then make sure you actually check your archive and clean it up regularly.
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Recipient Filtering Use recipient filtering to filter messages sent to addresses that you know are only spam catchers. These filters will not apply to authenticated users or internal Exchange servers, so they won t interfere with any normal internal e-mail.
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1. If you don t have the Message Delivery Properties dialog open, open it, and click the Recipient Filtering tab as shown in Figure 14-39.
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F14KR39
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Figure 14-39.
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Using recipient filtering to catch e-mail sent to addresses that get only spam sent to them.
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2. Click Add to type a recipient e-mail address to block (you can use wildcards here), and click OK after you type it in.
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14
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Using Exchange Server
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3. Click Edit to modify a currently blocked recipient, or click Remove to remove the recipient from the list. 4. Select the check box to filter recipients who are not in Active Directory. Security Alert Although it might seem like a good idea to filter out any e-mail sent to non-existent addresses in your domain, that filtering process is actually one way spammers can tell what is a valid address. So we think it s probably not a good idea. 5. Click OK when you re finished.
Managing Queues
Exchange Server uses queues to handle incoming and outgoing messages. Some of the things you can do with queues are:
View and monitor queues Find messages that are in a queue Shut down all outgoing queues immediately
Viewing and Monitoring Queues To view the queues on your server, open the Server Management console, expand Advanced Management, expand your Exchange server, expand Servers, expand your server name, and then click Queues to open the Queue Viewer shown in Figure 14-40.
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Figure 14-40.
The Queue Viewer for Exchange Server.
360 |
Part IV
Performing Advanced Tasks
From here you can see a number of queues, most of which you ll never have to do anything with. But if you see a queue with a bunch of messages in it, chances are there s a problem.
Finding the Messages In a Queue If you have a queue with one or more messages in it, you can see what those messages are and take steps to either remove the messages or retry sending them once the reason they got stuck is resolved. Sometimes the problem is simply a bad message and the only resolution is to remove it. Or, if the message is generated by spam, it might be trying to reach a nonexistent domain or addressee within a domain. To find the messages in a queue:
1. Open the Queue Viewer as described in the preceding section, Viewing and Monitoring Queues. 2. Highlight the queue you want to view the messages in, as shown in Figure 14-41.
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Figure 14-41.
The Queue Viewer, with the SMTP connector to Contoso.com
highlighted.
3. Double-click the queue to open the Find Messages dialog box, as shown in Figure 14-42. 4. You can specify search parameters, or to search for all messages in the queue, leave the fields blank and click Find Now.
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