Webmail Send / Receive works but Outlook doesn't | Digital Ocean

[dipakcg]

Hi community,

As title says, email configured with Sentora running on DigitalOcean CentOS 6.7 droplet works (send / receive) in webmail (roundcube) but doesn't with Outlook or any other third party mail client.

I've tried different ways such as opening port 587, checking firewall rules etc. but no joy.

Is this DigitalOcean thing? I've different server running zPanel and I compared main.cf and master.cf of postfix which seems ok to me.

Anything else I should look into?

Thanks in advance,

--Dipak G.

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Additional info.:
- Have default main.cf and master.cf of Postfix (Sentora).
- Already added following line in master.cf for port 587.

Code:

submission inet n       -       n       -       -       smtpd

- Domain is: elixirnews(dot)com (if want to check DNS / MX records)