==== REQUIRED BASIC INFO OF YOUR IREDMAIL SERVER ====
- iRedMail version (check /etc/iredmail-release): 1.3.2
- Deployed with iRedMail Easy or the downloadable installer?
- Linux/BSD distribution name and version:  ubuntu 18.04
- Store mail accounts in which backend (LDAP/MySQL/PGSQL): Mysql
- Web server (Apache or Nginx): Nginx
- Manage mail accounts with iRedAdmin-Pro? standard
- [IMPORTANT] Related original log or error message is required if you're experiencing an issue.
====

Dear All,

I'll be needing your help to my iredmail issue as below:
"Newly created users are not able to send email to gmail.com, however existing emails address are able to send email to gmail.com"
What is really happening here?

Part of the log"
Feb  7 08:01:39 bit postfix/smtp[41307]: 4DYH7H436Zz2hLB3: to=<jdg@gmail.com>, relay=gmail-smtp-in.l.google.com[66.102.1.27]:25, delay=8, delays=0/0.01/6.6/1.4, dsn=2.0.0, status=sent (250 2.0.0 OK  1612674099 r132si773398wma.1$
Feb  7 08:01:39 bit postfix/qmgr[38097]: 4DYH7H436Zz2hLB3: removed
Feb  7 08:02:43 bit postfix/submission/smtpd[41282]: connect from localhost[127.0.0.1]
Feb  7 08:02:43 bit postfix/submission/smtpd[41282]: Anonymous TLS connection established from localhost[127.0.0.1]: TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)
Feb  7 08:02:43 bit postfix/submission/smtpd[41282]: 4DYH8g6J3xz2hK7R: client=localhost[127.0.0.1], sasl_method=LOGIN, sasl_username=jung@domain.com
Feb  7 08:02:43 bit postfix/cleanup[41293]: 4DYH8g6J3xz2hK7R: message-id=<da9dadb2e5bcab6e314fff6be51400a2@domain.com>
Feb  7 08:02:43 bit postfix/qmgr[38097]: 4DYH8g6J3xz2hK7R: from=<jung@domain.com>, size=5241, nrcpt=1 (queue active)
Feb  7 08:02:43 bit roundcube: <4podb8o5> User jung@domain.com [192.168.222.2]; Message <da9dadb2e5bcab6e314fff6be51400a2@domain.com> for jdg@gmail.com; 250: 2.0.0 Ok: queued as 4DYH8g6J3xz2hK7R
Feb  7 08:02:43 bit postfix/submission/smtpd[41282]: disconnect from localhost[127.0.0.1] ehlo=2 starttls=1 auth=1 mail=1 rcpt=1 data=1 quit=1 commands=8
Feb  7 08:02:50 bit postfix/10025/smtpd[41306]: connect from localhost[127.0.0.1]
Feb  7 08:02:50 bit postfix/10025/smtpd[41306]: 4DYH8p3PDtz2hP5j: client=localhost[127.0.0.1]
Feb  7 08:02:50 bit postfix/cleanup[41293]: 4DYH8p3PDtz2hP5j: message-id=<da9dadb2e5bcab6e314fff6be51400a2@domain.com>
Feb  7 08:02:50 bit postfix/10025/smtpd[41306]: disconnect from localhost[127.0.0.1] ehlo=1 mail=1 rcpt=1 data=1 quit=1 commands=5
Feb  7 08:02:50 bit postfix/qmgr[38097]: 4DYH8p3PDtz2hP5j: from=<jung@domain.com>, size=6738, nrcpt=1 (queue active)
Feb  7 08:02:50 bit amavis[54278]: (54278-01) Passed CLEAN {RelayedInternal}, ORIGINATING/MYNETS LOCAL [127.0.0.1]:40694 ESMTP/ESMTP <jung@domain.com> -> <jdg@gmail.com>, (), Queue-ID: 4DYH8g6J3xz2hK7R, Mess$
Feb  7 08:02:50 bit postfix/amavis/smtp[41298]: 4DYH8g6J3xz2hK7R: to=<jdg@gmail.com>, relay=127.0.0.1[127.0.0.1]:10026, delay=6.6, delays=0.07/0/0.01/6.5, dsn=2.0.0, status=sent (250 2.0.0 from MTA(smtp:[127.0.0.1]:10025): 250 $
Feb  7 08:02:50 bit postfix/qmgr[38097]: 4DYH8g6J3xz2hK7R: removed
Feb  7 08:02:51 bit postfix/smtp[41307]: Trusted TLS connection established to gmail-smtp-in.l.google.com[66.102.1.27]:25: TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)
Feb  7 08:02:52 bit postfix/smtp[41307]: 4DYH8p3PDtz2hP5j: to=<jdg@gmail.com>, relay=gmail-smtp-in.l.google.com[66.102.1.27]:25, delay=2, delays=0/0/1.6/0.47, dsn=2.0.0, status=sent (250 2.0.0 OK  1612674172 p22si795895wmg.47 -$
Feb  7 08:02:52 bit postfix/qmgr[38097]: 4DYH8p3PDtz2hP5j: removed
Feb  7 08:07:20 bit postfix/submission/smtpd[42082]: connect from unknown[192.168.222.2]

Thanks.
Jung