Cannot send email from my ubuntu 18.04.1 droplet

I have the same issue as this forum list:

I cannot send email using port 587, 465, or 25 with gmail as my smtp server. I read in the forum that this block must be removed by DO admin. Please help.


We create our own software with Java. We use java mail api to send email.

what software do you use to send email?

Any news please?

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