PostFix versus Sendmail
If you're new to PostFix but experienced with Sendmail, you probably want to know what's different between the two MTAs. One of the major differences is how each is configured straight out of the box on a stock system. If you telnet into SMTP on each MTA, you'll see this for Sendmail 8.12.10:
# telnet localhost 25
Trying 127.0.0.1...
Connected to localhost (127.0.0.1).
Escape character is '^]'.
220 es.playground.crudnet.org ESMTP Sendmail
8.12.10/8.12.10; Thu, 30
Oct 2003 22:42:38 -0500
ehlo t.net
250-playground.mydomain.com Hello localhost [127.0.0.1],
pleased to meet you
250-ENHANCEDSTATUSCODES
250-PIPEI INING
250-8BITMIME
250-SIZE
250-DSN
250-ETRN
250-AUTH GSSAPI DIGEST-MD5 CRAM-MD5 LOGIN PLAIN
250-DELIVERBY
250 HELP
The output for PostFix 2.0.11 is a bit different.
# telnet localhost 25
Trying 127.0.0.1...
Connected to localhost (127.0.0.1).
Escape character is '^]'.
220 es.playground.crudnet.org ESMTP Postfix
ehlo t.net
250-es.playground.crudnet.org
250-PIPELINING
250-SIZE 10240000
250-VRFY
250-ETRN
250-XVERP
250 8BITMIME
As you can see, SMTP-Auth is not configured by default under PostFix. It can be turned on easily in the /etc/postfix/master.cf file, however. Neither Sendmail nor PostFix binds to anything other than localhost, by default, for incoming SMTP.
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