Net::SMTPSyntaxError (501 Sender syntax err$ Heroku

Random issue with my ruby on rails application out of the blue. I’m getting a 501 error each time a user tries to submit the form. This error does not occur when I’m running the app locally, it only occurs when I push to Heroku.

heroku logs --tail(The error shows up below)

Net::SMTPSyntaxError (501 Sender syntax err$│

app/controllers/contact_controller.rb:38:$

def tour_create

@message = Message.new(params[:message])

@message.type = “Tour”

@message.save

if @message.valid?

UserMailer.tour_signup(@message).deliver

flash[:notice] = “Thank you for your interest in You’ll receive an email from us confirming your participation in this Thursday’s tour within 24- 48 hours.”

redirect_to("/tour/confirmed")

else

flash.now.alert = “Please fill all fields.”

render :tour_new

end

end

usermailer.rb

class UserMailer < ActionMailer::Base

default from: “string”

def tour_signup(message)

@message = message

	mail(:to => message.email,

		:cc => "string that is an email goes here",

		:subject => message.first_name + ", Let's Tour This Wednesday"

	)

end

def orientation_signup(message, date)

@message = message

@date = date

mail(:to => message.email,

:cc => “email”,

:subject => message.first_name + ",string that gets sent to users inbox

)

end

def ask_a_question(message)

@message = message

	mail(:to => "emailstringgoes here",

		:subject => message.first_name + " Has A Question"

	)

end

def trial_kickoff_confirmation_to_user(message, type)

@message = message

@date = message.event_time.strftime("%l:%M %P, on %A, %B %-d")

@type = type

type_subject = type.split.map(&:capitalize).join(’ ')

	mail(:to => message.email,

		:subject => "Your #{type_subject} Has Been Scheduled!"

	)

end

def trial_kickoff_confirmation_to_hosts(message, type)

@message = message

@date = message.event_time.strftime("%l:%M %P, on %A, %B %-d")

@type = type

type_subject = type.split.map(&:capitalize).join(’ ')

if type == ‘kick-off day’

email = ‘email’

else

email = ‘email’

end

	mail(:to => email,

		:subject => "#{type_subject} for " + message.first_name + " " + message.last_name

	)  

end

def new_member_from_batchbook(member, password)

@member = member

@password = password

mail(:to => @email,

#:cc => “emailgoes here string”,

:subject => “#{@first_name}, finish your profile at string.com!”

)

end

def member_import_notification message, status

@message = message

@status = status

mail(

:to => ‘email@string.com’,

#:cc => “email@string.com”,

:subject => “#{@message[‘first_name’]}, import to email@string.com #{status}!”

)

end

def no_new_member_notification

mail(

:to => ‘email@string.com’,

#:cc => “email@string.com”,

:subject => “Import ran. No new members!”

)

end

end

.ruby-env

bash -c ‘echo “POSTMARK_API_TOKEN=heroku config:get POSTMARK_API_TOKEN” >> .env’

bash -c ‘echo “POSTMARK_SMTP_SERVER=heroku config:get POSTMARK_SMTP_SERVER” >> .env’

bash -c ‘echo “POSTMARK_INBOUND_ADDRESS=heroku config:get POSTMARK_INBOUND_ADDRESS” >> .env’

Random issue with my ruby on rails application out of the blue. I'm getting
a 501 error each time a user tries to submit the form. This error does not
occur when I'm running the app locally, it only occurs when I push to
Heroku.

heroku logs --tail(The error shows up below)

Net::SMTPSyntaxError (501 Sender syntax err$│
                  app/controllers/contact_controller.rb:38:$

Possibly one of the parameters for the email is invalid. I suggest
you log all the parameters (from, to, subject, etc) and see how they
look.

Colin

I had a similar problem (four years ago). The problem involved the
setup of the active mailer, (in my case with GoDaddy) that I never
was able to resolve until I switched to gmail. I can’t remember
exactly what the setup was, but it matched the values I found on the
web for Rails to Gmail.
Good luck.
Don Z

I can't say for sure, but this might be a problem that the MTA you're
trying to use isn't configured or allowed to accept things from heroku, or
without some further authentication.

The error you’re getting is the SMTP server rejecting your MAIL FROM command because of an invalid address. You’ve sanitized it to “string” here, so I can’t say what’s wrong with it. Make sure it doesn’t contain any unwanted characters, and if it has dashes in it make sure they haven’t been converted to Unicode ones by a “helpful” autocorrect.

You may want to reach out to Postmark’s support and see if they can provide additional insight from their logs.

–Matt Jones