On Oct 16, 2012, at 7:02 AM, Larry Martell wrote: > This should be an easy one. I'm trying to get postfix going. I've > never done this before. I followed the directions at > http://wiki.centos.org/HowTos/postfix. I opened port 25: > > iptables -I INPUT -p tcp -m tcp --dport 25 -j ACCEPT > > Here's an attempt to send mail: > > [motor at localhost motor]# mail -v larry.martell at gmail.com > Subject: test > test > . > EOT > larry.martell at gmail.com... Connecting to [127.0.0.1] via relay... > 220 localhost.localdomain ESMTP Postfix >>>> EHLO localhost.localdomain > 250-localhost.localdomain > 250-PIPELINING > 250-SIZE 10240000 > 250-VRFY > 250-ETRN > 250-ENHANCEDSTATUSCODES > 250-8BITMIME > 250 DSN >>>> MAIL From:<motor at localhost.localdomain> SIZE=219 > 250 2.1.0 Ok >>>> RCPT To:<larry.martell at gmail.com> >>>> DATA > 250 2.1.5 Ok > 354 End data with <CR><LF>.<CR><LF> >>>> . > 250 2.0.0 Ok: queued as D26C8830F > larry.martell at gmail.com... Sent (Ok: queued as D26C8830F) > Closing connection to [127.0.0.1] >>>> QUIT > 221 2.0.0 Bye > > But I don't receive the mail. In a file in /var/spool/postfix/defer I see: > > <larry.martell at gmail.com>: connect to > alt2.gmail-smtp-in.l.google.com[2607:f8b0:400d:c00::1a]:25: Network is > unreachable > recipient=larry.martell at gmail.com > offset=654 > dsn_orig_rcpt=rfc822;larry.martell at gmail.com > status=4.4.1 > action=delayed > reason=connect to > alt2.gmail-smtp-in.l.google.com[2607:f8b0:400d:c00::1a]:25: Network is > unreachable > > Have I missed a step or done something wrong? ---- most home broadband providers block outbound port 25 from reaching any smtp servers other than the ones that they provide and typically require authentication in order to stop spam. Craig