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Other hostnames using barcode creation for visual studio .net control to generate, create gs1-13 image in visual studio .net applications. ASP.NET Local interfaces See page 724 for more information on exim4 configuration variables. Once you have restarted exim4, it will accept mail addressed to the local system. To receive email addressed to a domain, the DNS MX record (page 828) for that domain must point to the IP address of the local system.

If you are not running a DNS server, you must ask your ISP to set up an MX record or else receive mail at the IP address of the server. If you receive email addressed to an IP address, set dc_other_hostnames to that IP address..

720 20 exim4: Setting Up Mail Servers, Clients, and More Working with exim4 Messages When exim4 re European Article Number 13 for .NET ceives email, from both local and nonlocal systems, it creates in the /var/spool/exim4/input directory two files that hold the message while exim4 processes it. To identify a particular message, exim4 generates a 16-character message ID and uses that string in filenames pertaining to the email.

The exim4 daemon stores the body of the message in a file named by the message ID followed by D (data). It stores the headers and envelope information in a file named by the message ID followed by H (header)..

Frozen messages If exim4 cann visual .net ean13+2 ot deliver a message, it marks the message as frozen and makes no further attempt to deliver it. Once it has successfully delivered an email, exim4 removes all files pertaining to that email from /var/spool/exim4/input.

By default, exim4 delivers email addressed to the local system to users files in the mail spool directory, /var/mail, in mbox format. Within this directory, each user has a mail file named with the user s username. Mail remains in these files until it is collected, typically by an MUA.

Once an MUA collects the mail from the mail spool, the MUA stores the mail as directed by the user, usually in the user s home directory. The scheme that exim4 uses to process email addressed to a nonlocal system depends on how it is configured: It can send the email to a smarthost, it can send the email to the system pointed to by the DNS MX record of the domain the email is addressed to, or it can refuse to send the email. The mbox format holds all messages for a user in a single file.

To prevent corruption, a process must lock this file while it is adding messages to or deleting messages from the file; thus the MUA cannot delete a message at the same time the MTA is adding messages. A competing format, maildir, holds each message in a separate file. This format does not use locks, allowing an MUA to delete messages from a user at the same time as mail is delivered to the same user.

In addition, the maildir format is better able to handle larger mailboxes. The downside is that the maildir format adds overhead when you are using a protocol such as IMAP to check messages. The exim4 daemon supports both mbox and maildir formats (see dc_localdelivery on page 725).

Qmail (page 715), an alternative to sendmail and exim4, uses maildirformat mailboxes.. Mail addressed to the local system Mail addressed to nonlocal systems mbox versus maildir Mail Logs By default, e xim4 sends normal log messages to /var/exim4/mainlog, with other messages going to other files in the same directory. The following lines in a mainlog file describe an email message sent directly to a remote system s SMTP server. The exim4 daemon writes one line each time it receives a message and one line each time it attempts to deliver a message.

The Completed line indicates that exim4 has completed its part in delivering the message. Each line starts with the date and time of the entry followed by the message ID..

Working with exim4 Messages $ tail -3 /va r/log/exim4/mainlog 2010-07-19 23:13:12 1IBljk-0000t8-1Z <= U=sam P=local S=304 2010-07-19 23:13:17 1IBljk-0000t8-1Z => R=dnslookup T=remote_smtp H=filter. [64.

13.141.12] 2010-07-19 23:13:17 1IBljk-0000t8-1Z Completed.

The next entr .net vs 2010 UPC-13 y on each line except the Completed line is a two-character status flag that tells you which kind of event the line describes: <= => > *> == Received a message Delivered a message normally Delivered a message normally to an additional address (same delivery) Did not deliver because of a N command-line option Did not deliver because the address bounced Did not deliver because of a temporary problem. Information f ollowing the flag is preceded by one of the following letters, which indicates the type of the information, and an equal sign: H U P R T S Name of remote system (host) Username of the user who sent the message Protocol used to receive the message Router used to process the message Transport used to process the message Size of the message in bytes. The first lin visual .net GS1-13 e in the preceding example indicates that exim4 received a 304-byte message to be delivered to from sam on the local system.

The next line indicates that exim4 looked up the address using DNS (dnslookup) and delivered it to the remote SMTP server (remote_smtp) at

net, which has an IP address of 64.13.141.

12. The following log entries describe a message that exim4 received from a remote system and delivered to the local system:. 2010-07-19 23 :13:32 1IBlk4-0000tL-8L <=

com [66.249.82.

229] P=esmtp S=1913 id=7154255d0707192313y304a1b27t39f... 2010-07-19 23:13:32 1IBlk4-0000tL-8L => sam <sams@example.

com> R=local_user T=mail_spool 2010-07-19 23:13:32 1IBlk4-0000tL-8L Completed. See the exim4 .NET UPC-13 specification for more information on log files. If you send and receive a lot of email, the mail logs can grow quite large.

The logrotate (page 622) exim4-base file archives and rotates these files regularly..
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