Debian 10 hestiacp not able to send email

After installed hestiacp on new debian 10

R=dnslookup T=remote_smtp defer (-53): retry time not reached for any host for

for every email i do test the same issue. any thought?

Sounds like a DNS issue…


Already tested this, but no luck,
No changes done, once installed vps debian i did installed the hestiacp

Is port 25 blocked for outgoing traffic?