Cannot send email verification link through development and production environment - ruby-on-rails

Question

sendgrid is not sending email verification link in development and production environment.
My environment.rb file looks like this
ActionMailer::Base.smtp_settings = {
:user_name => ENV['SENDGRID_USERNAME'],
:password => ENV['SENDGRID_PASSWORD'],
:domain => 'heroku.com',
:address => 'smtp.sendgrid.net',
:port => '578',
:authentication => :plain,
:enable_starttls_auto => true
}
I added these two line in development.rb file look like this
config.action_mailer.delivery_method = :smtp
config.action_mailer.default_url_options ={:host => 'http://localhost:3000'}
In production.rb file I added these two lins
config.action_mailer.delivery_method = :smtp
config.action_mailer.default_url_options ={:host => 'warm-forest-79168.herokuapp.com',
:protocol => 'https'}
In my .profile file I exported my sendgrid username and password
export SENDGRID_USERNAME=XXXXXXX
export SNDGRID_PASSWORD=XXXXXXXX
The rest to add confirmable in devise user I followed wiki https://github.com/heartcombo/devise/wiki/How-To:-Add-:confirmable-to-Users
When I signup locally the mail is being sent but never recieved
Content-Type: text/html;
charset=UTF-8
Content-Transfer-Encoding: 7bit
<p>Welcome deepakchauhan3294#gmail.com!</p>
<p>You can confirm your account email through the link below:</p>
<p><a href="http://localhost:3000/users/confirmation?
confirmation_token=GKBtUsWUJ1N3HQow9d94">Confirm my account</a></p>
When I signup in production(heroku) I get the following error
Net::SMTPAuthenticationError (535 Authentication failed: Bad username / password
I have rechecked my username and password both are right still It is throwing error. Please help me I have been stuck in it for too long.