Local roundcube mail service is receiving emails but not sending

I have a droplet, with ubuntu OS (i guess 18.04) n did set up virtualmin & webmin on server to host multiple virtual servers / websites. Anyway, within virtualmin i installed roundcube to host a local email service for one of the virtual servers, all using virtualmin user-interface. Now the problem is I get to receive emails inside roundcube but when sending out it’s not being sent. Tried with recipients from gmail n hotmail n no emails are shown in inbox or spam.

So what would be the problem? mx records? or something else? note that I received emails without setting up any mx records

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It is possible that port 25 is closed for new accounts. This is something DigitalOcean has been doing to reduce spam on their network:

What I could suggest is trying to use port 587 with TLS for your outgoing emails rather than port 25.

Regards, Bobby