postfix troubleshooting

I. Principles of mail serviceThe mail service is one of the most commonly used services in our daily life. In the old release version, the default mail service is sendmail, and the default sending service is postfix in versions later than centos6. You also need to configure mx records through third-party DNS or internal DNS before configuring postfix. Before further configuration, we should clarify three co

File cleanup A server disk space alarm was reported recently. During the troubleshooting process, it was found that many small files had been accumulated under the "/var/spool/Postfix/maildrop" directory and wanted to be deleted directly at first, however, when you use RM to delete a file, the following message is displayed: "The parameter list is too long." Later, Rsync is used to identify the junk file:

1. Set the page timeout time[[email protected] ~]# Vi/var/www/extsuite/extmail/webmail.cfsys_sess_timeout = 30msys_sess_cookie_only = 130 minutes no operation will disconnect the page, and the multi-domain environment can be set separately for each domain.can also be set to timeout when the user closes the browser:Sys_sess_timeout = 0sys_sess_cookie_only = 12. Limit message size[[email protected] ~]# Vi/var/www/extsuite/extmail/webmail.cfsys_message_size_limit = 20971520Mail 20M, including attac

Mail Server (Postfix + Dovecot + Extmail + Extman Based on Virtual account) Lab Topology LAMP (Linux + Apache + MySQL + PHP) Environment Construction First, we need to build a LAMP Environment Install Apache [Root @ mail apr-1.4.6] # tar-zxvf apr-util-1.5.1.tar.gz-C/usr/local/src/ [Root @ mail apr-1.4.6] # cd/usr/local/src/apr-1.4.6/ [Root @ mail apr-1.4.6] #./configure -- prefix =/usr/local/apr [Root @ mail apr-1.4.6] # make [Root @ mail apr-

I sent an email today, but failed to send it. Then I went to the server to check the log and found that the hard disk was filled with the cache queue and logs of spam, Tail-F/var/log/maillog found the screen was flushed. Some logs are as follows: Aug 17 09:39:01 www postfix/error[1173]: 455F050663: to= Let's take a look at the process and load of the system. The system is dizzy and the load is 28, so the server is not moving. [[emailprotected] /]#

In the Internet world, most emails are delivered through sendmail. About 1 million users use sendmail to deliver hundreds of millions of emails each day. This is a real surprising number. Postfix tries to be faster, easier to manage, and safer, while maintaining sufficient compatibility with sendmail. The following describes how to install and configure postfix. Mail System

On RHEL5, install the mail system Postfix + CyrusSASL + dovecot -- Linux Enterprise Application-Linux server application information. For more information, see the following. RHEL5 is installed by default. No type of server is selected (such as WEB server, development server, and virtual server) Install postfix [Root @ rhel5 ~] #/Etc/rc. d/init. d/sendmail stop Close sm-client: [OK] Disable sendmail: [O

-------Start commandSystemctl Start DovecotService Courier-authlib RestartSystemctl Status Courier-authlibSystemctl Enable Courier-authlibSystemctl Start SASLAUTHDSystemctl Enable SASLAUTHD-------postfix-------ConfigurationFirst, equipment workSetenforce 0Systemctl Stop FirewalldIptables-p INPUT ACCEPTIptables-fIptables-xIptables-lSecond, install mysql5.7 Epel sourceYum install-y wgetwget http://dev.mysql.com/get/mysql-community-release-el7-5.noarch.r

RHEL5 installs Postfix + CyrusSASL + dovecot -- Linux Enterprise Application-Linux server application information. For details, see the following. RHEL5 is installed by default. No type of server is selected (such as WEB server, development server, and virtual server) Install postfix [Root @ rhel5 ~] #/Etc/rc. d/init. d/sendmail stop Close sm-client: [OK] Disable sendmail: [OK] [Root @ rhel5 ~] # Chkconfig

Postfix Email Forwarding: 421 Toomanyconnections. Please kindly advise !!! -- Linux Enterprise Application-Linux server application information. For details, refer to the following section. After configuring the Netease integrity mailbox Alliance according to the configuration provided by it, the log always displays Too transport connections. below is Netease's configuration, log, and my mailbox configuration. Please kindly advise, thank you !!! Netea

PostfixForTlsYes. It is provided by a set of patch files written by lutz janicke. This set of patch files can be obtained from the add-on software link on the postfix homepage. If you use the pre-compiled postfix package that is included with the platform, make sure that this version does contain the tls patch. In addition to the tls support for postfix, you must

====================================== Related Software:1. Send email --- postfix 2. Identity Authentication --- sasl2 3. receive email --- dovecot 4. Anti-Virus email --- clamAV 5. Anti-Spam --- spamassassin 6. Control the virus and spam scanner --- amavisd-new ====================================== Questions to be improved: 1. group email permission settings 2. user mailbox quota limit ====================================== Complete email system ar

As a result of the writing of an article also just contact Postfix, the e-mail system is also very superficial understanding, although barely built to run the mail system, but also exposed a lot of problems. At the same time blind pursuit of function, make the whole installation process is long, for want to get started friend is more difficult. This time I will revise the previous article, and remove the search and anti-spam functions, complete the in

Postfix Anti-Spam technology-Linux Enterprise Application-Linux server application information. The following is a detailed description. The Anti-Spam function of MTA is to filter sessions during MTA processing. This filter not only filters the Spam Sent to itself, but also prevents itself from being maliciously used to send spam. Postfix implements all major MTA filtering technologies .. MTA filtering is

Installation environment: redhat5.8 2.6.18-194.el5 i386MySQL 5.6.25 (mysql> SELECT VERSION ();)Before installationClose SendMail service sendmail stop chkconfig sendmail offInstalling the GCC environment yum-y install gcc+Confirm that the development environment is installed;Development LibrariesDevelopment ToolsStart the MYSQLD database service. Service mysqld StartStart SASLAUTHD Services Service SASLAUTHD startAdd postsfix Account: Groupadd-g 2525 postfixUseradd-g 2525-u 2525-s/sbin/nologin-m

Linux server postfix service configuration postfix (MTA) mail System role 1, MUA (mail User proxy) mail/mutt foxmail outlook web2, MTA (mail Transmission proxy) exchange notes sendmail postfix qmail 3. MDA (Mail Distribution agent) Mail Application Protocol 1. SMTP, Simple Mail transmission protocol, TCP port 25, encrypted port 465, and mail, it generally works o

When creating a Web site application, it is an essential operation to send a message to the user when doing some action. The cloud service is a good choice, though. However, if the volume is too small, or subject to certain conditions, the self-built service may be a better choice. The following attempts to build the function of sending mail in CentOS 7. Install Postfix Postfix is the MTA (Mail transfer a

Introduction of Postfix Postfix is an e-mail server that is served by the IBM Watson Research Center (T.J). Wietse Venema, a Dutch researcher at Watson Research Center, was created to improve the SendMail mail server. First appeared in the late 1990, is an open source software.Postfix Official website: http://www.postfix.org/Postfix Download Address: http://www.

The mail server configuration is troublesome because you need to know a lot about the domain name service DNS/Bind, Web sending and receiving emails Apache/PHP/MySQL/SquirrelMail, authentication service LDAP, Kerberos, PAM, emails are usually stored in additional storage but also NFS/SAN, mail service Postfix/Dovecot, anti-spam Postgrey/Clam AV/SpamAssassion, security authentication SSL, monitoring and backup, etc, this set covers almost all aspects o

When sending an email,PostfixUse the system's resolver (that isDNSClient, which can query the domain information function library from the DNS server) to obtain DNS information. When receiving A mail, the DNS of your domain must provide delivery information (MX or A record) for external queries so that other MTA can find your postfix server. Influence of DNS on the sender Program The smtp MDA of postfix mus