Contact Form 7 failed to send message for only one website.
I have currently 3 wordpress websites on my droplet. Contact Form 7 is working perfectly fine for 2 websites (www.encodedigital.co.uk & www.encodedigital.info)
but it is not working for website (www.devheating.co.uk). I am getting message "Failed to send your message. Please try later or contact the administrator by another method."
I have no idea, why it is not working for just one website. I have all websites in /var/www/ folder and has give same permissions.
I also tried to send email via terminal, which works fine. So postfix is working fine, (that's why other 2 websites working fine as well), but not this one.
Could someone help me out?
I am trying various solutions as per google, but no luck. Please let me know if you want to see any file. Not sure which one to attach now.
P.S - I have recently moved to VPS from shared hosting, so struggling bit.