I am a developer too. I got an error working on the mailgun integration.
The screenshot for the error is like this: [login to view URL]
Let me know if you have experience in this error.
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I can help you in setting up mailgun. Your screen shot link is not working. Kindly check my reviews. My reviews show the quality of the services that I am offering to my clients. Also, kindly check my Portfolio site Daha Fazla
Hello, I've worked with mailgun in numerious PHP applications. I am experienced in this domain and can help you fix this bug. I would appreciate your consideration.