It's a common scenario when you want to send an email and have a list of recipients which for business purpose needs to be in BCC.

Currently the error which comes from the MailGun Api is "'Bad Request - 'to' parameter is missing' error."

Here are some StackOverflow threads about this
* http://stackoverflow.com/questions/28503099/how-to-send-mail-only-to-bcc-with-mailgun-php-api
* http://stackoverflow.com/questions/34400386/do-i-have-to-specify-a-to-recipient

Right now mailgun SDK provides no method to download attachment given we have the URL. Only method is to download the attachment via language specific libraries like open-uri for ruby and we have to pass parameters for authorization. It would be great if there is a pre-built method to download attachments easily

It might be helpful for some users if the "/messages" API endpoint would accept attachments as Base64-encoded strings, with a name and content-type described somehow.

We had a bug on our end that sent the same message to the same recipient thousands of times—resulting in thousands of spam reports while we were oblivious until months later.

While there are things we could do on our end to improve quality control and ops, etc., it would be amazing if Mailgun could provide a duplicate detection feature. I'm imagining saving a hash of content for sent messages, and catching any time we repeat the content to any recipient. A repeat could be prevent, or an alert sent, or both.

In Mailgun you should be able to use a test api key to experiment with Mailgun's API. No mail should be sent, but webhooks should trigger normally and you should be able to generate synthetic bounces and complaints without impacting your reputation.

This also lets the developer to setup a development environment that is similar to the production environment without the risk of sending any mails by misstake.

We would like to pay you guys real money to have the option to extend our log retention...there have been many cases where we need more than 30 days, and we dont want to setup webhook or anything external...your UI is perfectly good!

...you like money right

Currently the API allows POSTing a CSV list of users to be added to a mailing list.

I would like to POST a list of users in CSV who should be deleted from a mailing list

Make a template editing unsubscribe page (use this template in the mailing lists). Suggest using the editing unsubscribe page for use in various languages ​​(e.g. Russian, French, German, etc.), similar to the design of the main site, and more.

I would like to save myself from having download an attachment if I already have a matching file stored locally.

Our organisation sends out alot of product brochure that are mostly all identical.

Rather than download this attachment in our application, I would use the copy I have on hand. Saving alot of bandwidth/server load