Rails SendGrid Email From Development Environment - ruby-on-rails

Question

We use SendGrid in a production app and it works fine. We were recently trying to test a new feature/email in development however and cannot seem to get an email to send. Any idea where we're going wrong? We are using similar features to production and we also followed SendGrid's implementation guide. Feels like I'm missing something simple!
First I exported the SENDGRID_USERNAME and SENDGRID_PASSWORD and for kicks added it to my .bash_profile
export SENDGRID_USERNAME=xxxxxxx
export SENDGRID_PASSWORD=xxxxxxx
I've confirmed in the console that these exist and are correct.
Created a developer_email.html.erb file:
<p>Hi! Sendgrid test</p>
And a DeveloperMailer file:
class DeveloperMailer < ActionMailer::Base
default from: "tom#xxxxxx.com"
def developer_email(developer_id)
#recipients = ["tom#xxxxxx.com"]
mail(to: #recipients, subject: 'Does sendgrid work?')
end
end
Updated the development.rb file:
config.action_mailer.raise_delivery_errors = true
config.action_mailer.default_url_options = { :host => 'localhost:3000' }
config.action_mailer.perform_deliveries = true
config.action_mailer.delivery_method = :smtp
config.action_mailer.smtp_settings = {
address: 'smtp.sendgrid.net',
port: '587',
domain: 'localhost:3000',
user_name: ENV['SENDGRID_USERNAME'],
password: ENV['SENDGRID_PASSWORD'],
authentication: :plain,
enable_starttls_auto: true }
When I go to send the email in the console, it acts like it sent, but the email never actually arrives:
DeveloperMailer.developer_email(1) #to send the email. Seems to work:
2.3.1 :001 > DeveloperMailer.developer_email(1)
Rendered developer_mailer/developer_email.html.erb (1.5ms)
DeveloperMailer#developer_email: processed outbound mail in 133.3ms
=> #<Mail::Message:70263824429080, Multipart: false, Headers: <From: tom#xxxxx.com>, <To: ["tom#xxxx.com"]>, <Subject: Does SendGrid Work?>, <Mime-Version: 1.0>, <Content-Type: text/html>>
#But I never get anything sent to my email
Any idea what I might be missing?
EDIT
Updated development.rb file:
config.action_mailer.raise_delivery_errors = true
config.action_mailer.default_url_options = { :host => 'localhost:3000' }
config.action_mailer.perform_deliveries = true
config.action_mailer.delivery_method = :smtp
config.action_mailer.smtp_settings = {
address: 'smtp.sendgrid.net',
domain: 'example.com',
user_name: ENV['SENDGRID_USERNAME'],
password: ENV['SENDGRID_PASSWORD'],
authentication: :plain,
enable_starttls_auto: true }
Still no email though.

Answer 1

First, do telnet by following commands
telnet smtp.sendgrid.net 2525
If you get proper response from SMTP Service then change SMTP port from 587 to 2525
In my case "587 port" is not responding
After changing the port it works for me

Answer 2

domain in this context is an SMTP HELO domain, not the actual environment's domain. Change it to the same domain you use in your SendGrid profile and don't specify a port and give it a try.

Answer 3

You'd need to verify the sender email or domain of the sender email before you can send an email with SendGrid. See https://sendgrid.com/docs/ui/sending-email/sender-verification/ and https://sendgrid.com/docs/for-developers/sending-email/sender-identity/#domain-authentication