XenForo Contact Form: SMTP 554 5.7.1 Error due to From/Envelope-From mismatch (Namecheap Private Email)

[Can]

Hi there,

I'm using XenForo 2.3.7 on two forums with contact forms enabled:

– Fenerbahçe Forum | Gerçek Taraftarın Buluşma Noktası
– Almanca Kulübü

My mail service is through Namecheap's Private Email (SMTP), which strictly requires the "From" and "envelope-from" headers to match the authenticated domain email address. Otherwise, it rejects the message with the following error:

554 5.7.1 <From> and <envelope-from> fields in the email headers don't match. Reason: JFE040011

In my XenForo...

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