Receive emails from gmail or any other email provider ( IMAP Ruby On Rails )


Configure your gmail for sending emails to other mail clients 

You can retrieve your Gmail messages with a client or device that supports IMAP, like Microsoft Outlook or Apple Mail.

Enable IMAP in your Gmail settings

1. Sign in to Gmail.
2. Click the gear in the top right .
3. Select Settings.
4. Click Forwarding and POP/IMAP.
5. Select Enable IMAP.
6. Click Save Changes.

If you’re using a client that’s not listed above, you can also use the following information to configure your IMAP. If you have problems, contact your mail client’s customer support department for further instructions.

Incoming Mail (IMAP) Server – Requires SSL
imap.gmail.com
Port: 993
Requires SSL:Yes

For more information about imap you can refer that link
https://support.google.com/mail/troubleshooter/1668960?hl=en#ts=1665018%2C1665144

After that go to this url and you will find lots of information for allowing access by device or any mail client:
https://support.google.com/mail/accounts/answer/78754
=> You can find out the screenshot of same thing below that I have followed to get access for my ruby on rails application

1. Allow access to your Google account: 
https://accounts.google.com/b/0/DisplayUnlockCaptcha



2. Access for less secure apps:
https://www.google.com/settings/security/lesssecureapps


After doing all these configurations and setting, we can access the gmail emails using IMAP : 

We are using ruby libraries to fetching emails from gmail  using :
An IMAP client connects to a server, and then authenticates itself using either authenticate() or login().

List sender and subject of all recent messages in the default mailbox

require “net/imap.rb”
imap = Net::IMAP.new(‘imap.gmail.com’,993,true)
# We are using gmail as a mail provider so below mentioned method can be differ as per mail provider
imap.login(‘[email protected]’, ‘password’)
imap.examine(‘INBOX’)
imap.search([“All”]) // Shows all ids of inbox message
imap.search([“All”]) /
imap.search([“RECENT”]).each do |message_id|
  envelope = imap.fetch(message_id, “ENVELOPE”)[0].attr[“ENVELOPE”]
  body = imap.fetch(message_id,’BODY[TEXT]’)[0].attr[‘BODY[TEXT]’]
  puts “#{envelope.from[0].name}: t#{envelope.subject}”
end

For more information about using imap with ruby you can refer below mentioned link
http://ruby-doc.org/stdlib-1.9.3/libdoc/net/imap/rdoc/Net/IMAP.html

Example: Imap service that fetch the new updated emails from gmail. We are saving id of last gmail mail in database



class ImapService
require "net/imap.rb"

def initialize(params={})
@email = params[:email] || '[email protected]'
@password = params[:password] || 'testpassword'
@imap_server = params[:imap_server] || 'imap.gmail.com'
@port = params[:port] || 993
@ssl = params[:ssl] || true
end

def save_emails_in_database
imap = select_inbox
latest_email = LatestEmail.last
## Check that in database we have stored an id of last fetched email or not
last_email_id = latest_email.email_id rescue nil
if last_email_id
## We will fetch all emails greater than the saved id in database
new_email_ids = fetch_latest_emails(imap, last_email_id)
fetch_body_and_save(imap, new_email_ids)
last_email_id = new_email_ids.last
else
last_email_id = fetch_last_email(imap)
end
true
## Save last_email_id in database
if latest_email.blank?
latest_email = LatestEmail.new(email_id: last_email_id)
else
latest_email.email_id=last_email_id
end
latest_email.save
end

def save_latest_emails_in_database
begin
save_emails_in_database
rescue
false
end
end

private
attr_reader :email, :password, :imap_server, :password, :port, :ssl

# attr_reader :address

def external_imap_service
Net::IMAP
end

def fetch_latest_emails(imap, last_email_id)
imap.search("#{last_email_id}:*")
end

def fetch_all_emails(imap)
imap.search("all").last
end

def connect_to_imap
external_imap_service.new(imap_server,port,ssl)
end

def select_inbox
imap = connect_to_imap
imap.login(email, password)
imap.examine('INBOX')
return imap
end

def fetch_body_and_save(imap, new_email_ids)
new_email_ids.each do |email_id|
body_text = fetch_email_body(imap, email_id)
## Save your emails from here :-)
end
end

def fetch_email_body(imap, email_id)
imap.fetch(email_id,'BODY[TEXT]')[0].attr['BODY[TEXT]']
end

end



About the author

Being the CEO and Founder of ClecoTech International, Mr. Ashish Prajapati is dedicated towards his aim of mentoring young startups into a full-fledged businesses. He is helping startups from America, Europe, India, and various other countries through proper guidance and the use of latest technologies to develop their innovation and ideas into definite realities.

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