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Topic: Unable to send mails || Getting status=deferred

==== REQUIRED BASIC INFO OF YOUR IREDMAIL SERVER ====
- iRedMail version (check /etc/iredmail-release): 1.6.0
- Deployed with iRedMail Easy or the downloadable installer? downloadable installer
- Linux/BSD distribution name and version: linux
- Store mail accounts in which backend (LDAP/MySQL/PGSQL): MySQL
- Web server (Apache or Nginx): Apache
- Manage mail accounts with iRedAdmin-Pro? No
- [IMPORTANT] Related original log or error message is required if you're experiencing an issue.
====

Jul 13 09:42:07 dulipudi postfix/smtp[147063]: 4Lgc6R6T2Qz10T2d: to=<test-4pjurm02t@srv1.mail-tester.com>, relay=none, delay=252168, delays=252137/0.06/31/0, dsn=4.4.1, status=deferred (connect to reception.mail-tester.com[94.23.206.89]:25: Connection timed out)
Jul 13 09:42:36 dulipudi postfix/smtp[147065]: connect to mta6.am0.yahoodns.net[67.195.204.79]:25: Connection timed out
Jul 13 09:43:06 dulipudi postfix/smtp[147065]: connect to mta7.am0.yahoodns.net[98.136.96.75]:25: Connection timed out


getting above log and unable to send mail's. But able to send mail & receive from gmail.

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Re: Unable to send mails || Getting status=deferred

Looks like your ISP blocks outgoing traffic on port 25