Is DO blocked 587 port? I can not use smtp of my office365

June 24, 2019 2.8k views
Applications CentOS

I use office365 for my business.
I tried to setup smtp in my site but it not success.
I tried telnet to at port 587 but not success too.
Is DO blocked 587 port? If yes, please open it. It is importance to me.
My IP is

2 Answers


I belive that you just need to make sure that you open port 587 for outgoing TCP connections on your droplet itself.

Hope that this helps!


  • Hi bobby,
    Thanks for your reply,
    I used csf as firewall and pretty sure that 587 port are opened.

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