Testing Mailgun batch sending with gmail '+' aliases - mailgun

I'm currently trying to integrate Mailgun to send mails in batch. To test the batch sending, I decided to use a list of 10 email aliases to my own address, using a "+" alias.
For example, I'd use a list like this:
myaddress+1#gmail.com
myaddress+2#gmail.com
myaddress+3#gmail.com
etc.
To call mailgun, I'm only using a POST http call, reproducing the curl example from the Mailgun documentation.
The problem is that when I use aliases, I only receive the email once, on a random alias (e.g. myaddress+3#gmail.com). In Mailgun's logs, all the 10 emails appear as delivered.
Is this problem coming from Gmail which would filter similar mails arriving at once ? Has anyone encountered this type of problem before ?
When I add a different address (not an alias), the latter seems to receive the email correctly, but I'd like to understand why the email couldn't be sent several times to the same address.

Related

How to setup an email address for sending only?

My main goal is to setup an email address for my server to use for sending emails only.
I did some research, and it looked like Amazon Simple Email Server and/or Amazon Workmail could provide me with what I needed. I've gotten as far as setting up SES and Workmail so that I can set my server to be able to send emails. However, I saw that once the Workmail inbox is full (50GB), the account would be unable to send emails. Given that this is going to be used by the server and not a human, I didn't want the inbox to get filled with auto replies, spam, or failed to send messages, and then be unable to send emails. So, I went looking for a way to either:
A) prevent emails from being received and stored in the inbox
B) a rule I could setup to delete anything that didn't match the company domain
C) be able to read the inbox and delete email messages using the AWS CLI, and I'd setup my own script to manage how and what was deleted when
So far I haven't had any luck.
Again, I'm not particular how I achieve the goal, but I do preferably need to find a way to have an email address for a server to use exclusively for sending messages. I worry that if I leave it to employees to remember to login and clear the inbox, someone will forget, and then the server will stop sending emails.
Any direction or advice would be greatly appreciated.
I'm not well versed in email protocols; could I setup the address to return a bounce back always, and that would prevent it from receiving emails into it's inbox?
How are you generating these emails? If you are generating them programmatically (via an app/script), you may not need to set up a server. If you just route the outgoing mail through your app to SNS, the emails will be valid, however, there will be no "inbox" for incoming mail and they will just be dumped. This way you don't have to actually worry about an inbox getting full as it will just drop anything coming in.
https://docs.aws.amazon.com/ses/latest/DeveloperGuide/receiving-email.html
In order to receive emails though SNS, you have to go through the setup linked above, but if you do not set this up, then emails will just bounce. At least, that is how I have been doing it.

"Read" Emails with Django

Currently sending emails with Django, and was wondering if there was any way to periodically check my inbox with Django (or ideally somehow alert the server upon receipt of a new email), and have Django extract the message and save it in the database.
You could use an email service such as SendMail or Mandrill (latter definitely has free accounts, former may have).
Each of these services provide inbound email support via webhooks. You provide them an endpoint to hit (make sure to use HTTPS) and when they receive an email to an address you have registered they will send the data via HTTP POST to you.
It is then just a simple case of storing this data to the database. There are a number of 3rd party packages that can help you with this:
http://djrill.readthedocs.org/en/v1.4/usage/webhooks/
https://github.com/yunojuno/django-inbound-email
https://github.com/jpadilla/mandrill-inbound-python
https://github.com/michaelhelmick/python-mailsnake
Although it's rather simple to roll your own should need be.

Receiving emails with sendgrid and cloudmailin

I have the same concept as mentioned in this question(generating a unique random email address for each user in rails app. When the user sends an email that that randomly generated email address, we process the body and store in db.
I followed the following steps:
Deployed my app in Heroku
Created a sendgrid account and configured the username and password to heroku(to get the sendgrid addon).
added griddler gem and followed the steps mentioned in griddler.
Configured the parse webhook in sendgrid with my host and url.
Here comes the main problem:
I registered to coludmailin and it generated the single email address. I don't really understand how to receive uniq emails to my rails application now. I tried white labeling the cloudmailin.net in sendgrid but it doesn't work(may be am wrong here).
Googled a lot but didn't understand how to proceed from here. Can someone please help me in solving this issue. Appreciate if I get a good step-by-step reference
There are two options to do this with CloudMailin.
Option 1:
On the free plan you can use a + in order to separate the email address given to you on CloudMailin and still create a unique email address that each customer can respond to. For example:
If you CloudMailin email address is example1234#cloudmailin.net you can use example1234+unique_id_54321#cloudmailin.net. CloudMailin calls unique_id_54321 the disposable part of this email address. This way you can send an email out and state the sender of that email is example1234+unique_id_54321#cloudmailin.net and then tell one user from another.
Option 2 (the better option):
However, the best way to do this is to use CloudMailin's custom domains. You can then receive anything#yourdomain.com.
With custom domains enabled you set CloudMailin up to be your MX server. Then any email coming into yourdomain.com goes direct to CloudMailin (you can use app.yourdomain.com to avoid conflicts with your regular email if needed).
You can then send email out with the sender as user-12345#yourdomain.com, task-12345#yourdomain.com or any other unique identifier. When you receive the email from CloudMailin the envelope will show that the email was sent to user-12345#yourdomain.com and you can then use this to resolve who the user was.

How to strip attachments from inbound mails in Mailgun before POSTing?

Is it possible for Mailgun to POST only the non-attachment part of emails to my API, to prevent big attachments affecting the performance of the app?
Mailgun can host the attachments for you with the inbound functionality.
You can use the Events API command store(notify=”http://myapp/post”) specifying as shown the notify option, which will send a webhook to your application with a URL on message arrival.
One of the headers sent with through webhook will look something like: ["[{\"url\": \"https://api.mailgun.net/v2/domains/YOURDOMAIN/messages/ALARGESTRINGOFCHARACTERS/attachments/0\", \"content-type\": \"META/META\", \"name\": \"MYFILE.EXT\", \"size\": 74622}]"]
Then you can retrieve it and delete the stored message.
Keep in mind that stored messages are kept only for so long so you should process attachments rapidly.
This is one of the options of the routes functionality that Mailgun gives you.
Personally I love it ! Let me know if something is unclear i can dig into more details!
Best,
I am getting mail on the Mailgun which I am routing to my local server and their. I am parsing the JSON but problem is coming in case of attachments. In attachment json, it is showing the path of temporary file on mailgun server. I need to download the attachment and store it on my local machine.
My question is how to retrieve that attachment. Do we have any API for that?
To access the data from the link, you will need to specify credentials as your get parameters. The user is 'api' and the password is your mailgun's private key
Please refer to this answer that I've given here

How would I know that email has been sent or not via SendGrid in Django

I am working on django and sending emails to multiple users at once. in the given scenario it only tells me that if it has sent or not.
I want to display the report of same page that how many emails has sent to user successfully and how many not. more if i want to get details why email has failed to sent.
How would i do such things via SENDGRID APIs.
There are two options that I know of:
Connect to SendGrid Event Webhooks and start parsing events for every email to flag ones that were not sent. I believe you can configure SendGrid to only send certain events, so if you're interested in bounces you don't need to worry about handling all events.
The second option is to use a service like sendwithus which will connect to your SendGrid account on your behalf and track all bounces/opens/clicks for you and provide a simpler API/UI to view the data. I believe they do this via SendGrid's webhooks, so it's effectively the same solution but written for you.
Happy to elaborate on either, I've used both before.