Configuring Custom Email Headers via Mailgun API

Other Questions Mailgun
1

PHP cURL Example for Mailgun Headers

Show PHP cURL samples for setting custom email headers with Mailgun API.

Email A:

<?php
$apiEndpoint = 'https://api.mailgun.net/v3/example.com/messages';
$curlHandle = curl_init();
$fieldsA = [
  'from' => '"Alice" <[email protected]>',
  'to' => '[email protected]',
  'subject' => 'Test Email A',
  'text' => 'This is email A.',
  'h:Content-Type' => 'text/plain; charset=UTF-8',
  'h:Content-Transfer-Encoding' => '8bit'
];
curl_setopt($curlHandle, CURLOPT_URL, $apiEndpoint);
curl_setopt($curlHandle, CURLOPT_POST, true);
curl_setopt($curlHandle, CURLOPT_POSTFIELDS, $fieldsA);
curl_setopt($curlHandle, CURLOPT_RETURNTRANSFER, true);
$responseA = curl_exec($curlHandle);
curl_close($curlHandle);
echo $responseA;
?>

Email B:

<?php
$serviceUrl = 'https://api.mailgun.net/v3/example.com/messages';
$ch = curl_init();
$fieldsB = [
  'from' => 'example.com <[email protected]>',
  'to' => '[email protected]',
  'subject' => 'Test Email B',
  'text' => 'This email uses multipart features.',
  'h:Reply-To' => '[email protected]',
  'h:Content-Type' => 'multipart/alternative; boundary="BOUNDARY123"',
  'h:Message-ID' => '<[email protected]>'
];
curl_setopt($ch, CURLOPT_URL, $serviceUrl);
curl_setopt($ch, CURLOPT_POST, true);
curl_setopt($ch, CURLOPT_POSTFIELDS, $fieldsB);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
$responseB = curl_exec($ch);
curl_close($ch);
echo $responseB;
?>
2

hey i had similar probs with mailgun. i once messd up a header by mispellin h: prefix. taking time to check each header fixed it. sometimes its the littlest typo thats causing issues. hope this helps, good luck!

3

I have been working with Mailgun’s API for a couple of projects and encountered a few challenges when setting custom email headers. My experience taught me that using the h: prefix is incredibly helpful in ensuring the headers are processed properly by the API. I also learned that validating MIME types can be crucial, especially when handling multipart emails. While tracking down issues, I often relied on detailed server responses to pinpoint configuration problems. Over time, proper testing and careful formatting of header values helped avoid unexpected behavior, making my integration much more robust.

4

Having integrated Mailgun into my PHP projects for over a year, I can say that custom headers, when implemented correctly, can greatly enhance your email configuration. I frequently use the h: convention to set specific headers and have noticed that ensuring each header is correctly formatted is imperative to avoid issues during transmission. It is useful to test both text and multipart email setups thoroughly. I also found that comparing responses from failed and successful attempts helped me pinpoint header misconfigurations. Continuous testing and refinement have been key to my smooth implementation with Mailgun.

5

While working on my projects involving Mailgun, I found that configuring custom headers can sometimes be a bit tricky due to subtle syntax errors. I experienced issues early on by inadvertently setting values without quotation marks or overlooking a necessary colon. Careful inspection of API responses and a modular approach to testing various header fields helped me identify where things went wrong. I recommend double-checking your header values and the overall formatting, as even minor mistakes can lead to unexpected behavior in email delivery.