Hi! There's no reason why SendGrid shouldn't work as normal on a droplet. Are you seeing any errors from the API? Could you post a snippet of your code? Any additional info that you could provide would help us get to the bottom of the problem.

I have the same question.
In my case I have a rails application and have used the action mailer. So I have generated a mail and have configured mailers for sending a password reset, confirm sign in and contact us.
Example: this link
https://sendgrid.com/docs/Integrate/Frameworks/rubyonrails.html
It also shows configuration settings to point to SendGrid's servers

What I am confused about is.. do we need to add SMTP servers (like Postfix/Dovecot, which is quite a pain) or can we use sendgrid on its own?

The instructions for the API are different https://github.com/sendgrid/sendgrid-ruby https://sendgrid.com/docs/API_Reference/Web_API/mail.html

I have been following a tutorial from Michael Hartl https://www.railstutorial.org/ but he directs the reader to Heroku and it looks like Heroku has sendgrid as a standard set up. His tutorial uses the mailers and framework.

If there is any info on Sendgrid (Rails) .. step by step. That would be awesome. I also reached out to Sendgrid. If I learn more I will post it.

Hi guys, I have sendgrid working in my droplet. I had to open a ticket to the sendgrid Support team:

https://www.digitalocean.com/community/questions/i-can-t-connect-to-any-port-25-i-ve-tried-yahoo-mail-server-so-i-can-t-send-mail-from-the-vps

I got it to work by doing:

1. Added: gem 'sendgrid' to my gemfile

2. Edited /etc/default/unicorn and added

   export SENDGRID_USERNAME='username'
   export SENDGRID_PASSWORD='password'
   

3. $ service unicorn restart && service nginx reload

4. Edited config/environments/production.rb and added:

   config.action_mailer.raise_delivery_errors = true
   config.action_mailer.delivery_method = :smtp
   host = 'domain.com'
   config.action_mailer.default_url_options = { host: host }
   ActionMailer::Base.smtp_settings = {
   :address        => 'smtp.sendgrid.net',
   :port           => '587',
   :authentication => :plain,
   :user_name      => ENV['SENDGRID_USERNAME'],
   :password       => ENV['SENDGRID_PASSWORD'],
   :domain         => 'domain.com',
   :enable_starttls_auto => true
   }
   

I also had an issue where my password had spaces, apparently that caused an issue, so I created a new one (by creating a new credentials on sendgrid) without spaces and it worked perfectly.