ERORR：
Feb 14 14:09:04 es1 postfix/smtp[16443]: connect to mx3.hotmail.com[65.54.188.94]:25: Connection timed out
Feb 14 14:09:34 es1 postfix/smtp[16443]: connect to mx1.hotmail.com[104.44.194.231]:25: Connection timed out
Feb 14 14:10:04 es1 postfix/smtp[16443]: connect to mx1.hotmail.com[207.46.8.167]:25: Connection timed out
Feb 14 14:10:34 es1 postfix/smtp[16443]: connect to mx2.hotmail.com[65.55.37.104]:25: Connection timed out
Feb 14 14:11:04 es1 postfix/smtp[16443]: connect to mx1.hotmail.com[65.55.92.136]:25: Connection timed out
Feb 14 14:11:04 es1 postfix/smtp[16443]: 228D519C06D: to=<[email protected]>, relay=none, delay=395818, delays=395668/0.01/150/0, dsn=4.4.1, status=deferred (connect to mx1.hotmail.com[65.55.92.136]:25: Connection timed out)
I've host Mail Server on CentOS 6 with Postfix/Dovecot, I can receive mail from outside, but can't not sending mail to outside.
Things I've done:
Add spf record to dns, also validate successfully from http://www.kitterman.com/spf/validate.html?
v=spf1 ip4:x.x.x.x -all
Note:
I've change the default port 25 to 26 due to ISP block issue by adding etc/postfix/master.cf
26 inet n - n - - smtpd
Your ISP is probably blocking outbound port 25. Its very common. Your SPF record and inbound SMTP port makes no difference. I suggest you contact your ISP.