Frozen Email / Unroutable for domain

Ok so I’ve found a typo with the previous command I was using to send email to my external email server. So, now getting different type error message that seems to be more related to DNS issue. Below is the command being used to test sending out emails (See both failed and passed test below).
Appreciate any further help with this updated info.

*** Failed test from my hestiacp host to my external email server (Same local network)

[email protected]:/etc/exim4/conf.d/transport# echo “Subject: sendmail test” | sendmail -v [email protected]
LOG: MAIN
<= [email protected] U=root P=local S=368
[email protected]:/etc/exim4/conf.d/transport# delivering 1jxwH6-0005hc-Sx
LOG: retry_defer MAIN
== [email protected] R=dnslookup T=remote_smtp defer (-53): retry time not reached for any host for ‘My-Domain.com


*** GOOD TEST from email sent from hestiacp server to GMAIL account.

root@HostName:/etc/exim4/conf.d/transport# echo “Subject: sendmail test” | sendmail -v [email protected]
LOG: MAIN
<= [email protected] U=root P=local S=367
root@HostName:/etc/exim4/conf.d/transport# delivering 1jxw7g-0005Rf-8E
Connecting to gmail-smtp-in.l.google.com [74.125.142.27]:25 … connected
SMTP<< 220 mx.google.com ESMTP j1si12594262pld.31 - gsmtp
SMTP>> EHLO HostName.My-Domain.com
SMTP<< 250-mx.google.com at your service, [My-Ext-IP]
250-SIZE 157286400
250-8BITMIME
250-STARTTLS
250-ENHANCEDSTATUSCODES
250-PIPELINING
250-CHUNKING
250 SMTPUTF8
SMTP>> STARTTLS
SMTP<< 220 2.0.0 Ready to start TLS
SMTP>> EHLO HostName.My-Domain.com
SMTP<< 250-mx.google.com at your service, [My-Ext-IP]
250-SIZE 157286400
250-8BITMIME
250-ENHANCEDSTATUSCODES
250-PIPELINING
250-CHUNKING
250 SMTPUTF8
SMTP>> MAIL FROM:[email protected] SIZE=1399
SMTP>> RCPT TO:[email protected]
will write message using CHUNKING
SMTP>> BDAT 376 LAST
SMTP<< 250 2.1.0 OK j1si12594262pld.31 - gsmtp
SMTP<< 250 2.1.5 OK j1si12594262pld.31 - gsmtp
SMTP<< 250 2.0.0 OK j1si12594262pld.31 - gsmtp
SMTP>> QUIT
SMTP(close)>>
LOG: MAIN
=> [email protected] R=dnslookup T=remote_smtp H=gmail-smtp-in.l.google.com [74.125.142.27] X=TLS1.2:ECDHE_ECDSA_CHACHA20_POLY1305:256 CV=yes K C=“250 2.0.0 OK j1si12594262pld.31 - gsmtp”
LOG: MAIN
Completed