Contact Form 7 + Postman + Mandrill, File Attachments Not Working

Hello,

I have a Contact Form 7 contact form setup to accept file attachments and email them to us using Postman SMTP and Mandrill.

All of our regular email submissions are going through just fine with Contact Form 7 + Postman SMTP, but when I try to attach a file and send it, Contact Form 7 gives me a red box and the following notice: There was an error trying to send your message. Please try again later.

I tried disabling Postman SMTP and the email came through just fine (with the attachment). I assume this is because it’s using PHP vs. SMTP.

However, I’m pretty certain Postman SMTP is setup to be able to send file attachments. I just don’t know why it’s failing. Also– my client needs us to use SMTP so that the Contact Form 7 submissions reach their email addresses. It was failing with PHP.

Can you please help? Thank you!

PS: I also submitted this issue to the Postman SMTP support form (although I haven’t yet received an answer): https://www.ads-software.com/support/topic/contact-form-7-postman-mandrill-file-attachments-not-working/