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Asked: 2015-07-27 15:07:09 +0800 CST

What might be using my smtp port on a new CentOS machine?

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I'm trying to setup a simple email server using node smtp-server. I'm the only one that's ever accessed the machine (a CentOS 6.5 box on Digital Ocean), and I've only set up 2 http servers. I'm getting the error "EADDRINUSE" when I try to listen on port 25.

lsof | grep smtp gives me:

master      955    root   12u     IPv4               8103       0t0        TCP localhost:smtp (LISTEN)
master      955    root   13u     IPv6               8105       0t0        TCP localhost:smtp (LISTEN)
master      955    root   53u     unix 0xffff88003a91c380       0t0       8155 private/smtp

What might be using port 25, and how can I disable it?

linux

1 Answers

  1. Best Answer

    CentOS 6 default installation sets up Postfix listening on localhost. You can disable it with chkconfig or uninstall it with yum, but you need to provide a replacement as the system needs a way to send mail to an administrator in various situations.

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