telnet imap 993

In linuxas5.5, test postfix + cyrus-imap + cyrus-sasl -- Linux Enterprise Application-Linux server application information. For details, see the following. Test environment: Cat/proc/version Linux version 2.6.18-194. el5xen [Root @ mail ~] #

Before accessing the Google IMAP server, we need the OpenSSL tool. telnet is not powerful when it encounters a connection that requires SSL.  OpenSSL: Http://www.openssl.org/source/ For how to compile the OpenSSL library, see my other blog. 

One, install POSTFIX,CYRUS-SASL,CYRUS-IMAPD If the YUM hint cannot find the package, please change the source, please refer to CentOS 6 recommended to use Epel source The code is as follows: [Root@localhost ~]# Yum install postfix

This section describes the simple configuration of pop3 and ipops servers and the use of packet capture tools in Linux. domestic users generally prefer to use the pop3 protocol to receive emails, which is very insecure, this section also describes

1024 The following is reserved for the system, and from 1024-65535 is used by the userFor personal writing applications, try not to use a port number between 0 and 1024.1024 to 65535 we can program with. This is not a Linux rule, it is the socket

In network technology, port has two meanings: one is physical port, for example, ADSL modem, Hub, switch, router is used to connect other network equipment interface, such as RJ-45 port, SC port and so on. The second is the logical port, which

Hadoop-definitions of Computer Network PortsPort Introduction The ports described in this article are all logical ports, which refer to the ports in the TCP/IP protocol. The port number ranges from 0 to 65535, for example, port 80 used to browse Web

Linuxserverpostfix service configuration postfix (MTA) mail System Role 1, MUA (mail User proxy) mail/muttfoxmailoutlookweb2, MTA (mail transmission proxy) exchangenotessendmailpostfixqmail3, MDA (mail distribution generation... linux server postfix

[STMPFill in the record]One.1) "Prohibit specified IP remote stmp operation to Me"cd/etc/postfix/Vim access [add as follows in the last line]172.25.254.60 REJECTPostmap access [Refresh file] "At this point, there will be more than one access.db file"

Secure Sockets Layer (SSL) and later versions: Transport Layer Security (TLS) are two of the most widely used protocols used to encrypt data transmitted between servers and clients. These protocols often use X.509 certificates and asymmetric