Emails failing from Wordpress Contact Forms

Hi there,
I have a virtualmin server setup with a few different virtual servers running on it.

One in particular I’m having issues with. Email and DNS is not enabled against the virtual server. The DNS records are maintained elsewhere, and the email is provided elsewhere too.

I just have a website configured.

The website is a wordpress site with a contact form on it.

Whenever the contact form is completed and submitted, a bounced email goes to the server administration contact, and doesn’t get delivered. This is the entry in maillog when the form is submitted. It is trying to send the email from the server from what I can tell, but I don’t think it should be, as Mail for Domain is disabled.

May 5 08:44:03 linden-d2 postfix/pickup[26368]: 7A0F5C01060B7: uid=502 from= May 5 08:44:03 linden-d2 postfix/cleanup[27150]: 7A0F5C01060B7: message-id=a0bc837150e413246408f9a8a108a531@www.clipemandfellem.co.uk
May 5 08:44:03 linden-d2 opendkim[27342]: 7A0F5C01060B7: no signing domain match for ‘clipemandfellem.co.uk’ May 5 08:44:03 linden-d2 opendkim[27342]: 7A0F5C01060B7: no signing subdomain match for ‘clipemandfellem.co.uk
May 5 08:44:03 linden-d2 opendkim[27342]: 7A0F5C01060B7: no signature data May 5 08:44:03 linden-d2 postfix/qmgr[26367]: 7A0F5C01060B7: from=clipemandfellem@server-cp.com, size=825, nrcpt=1 (queue active)
May 5 08:44:04 linden-d2 postfix/smtp[27153]: 7A0F5C01060B7: to=info@clipemandfellem.co.uk, relay=mail.clipemandfellem.co.uk[79.170.40.147]:25, delay=0.87, delays=0.5/0.01/0.2/0.16, dsn=5.0.0, status=bounced (host mail.clipemandfellem.co.uk[79.170.40.147] said: 550-Verification failed for clipemandfellem@server-cp.com 550-Unrouteable address 550 Sender verify failed (in reply to RCPT TO command))
May 5 08:44:04 linden-d2 postfix/cleanup[27150]: 49211C01060B8: message-id=20170505074404.49211C01060B8@green6041.server-cp.com
May 5 08:44:04 linden-d2 postfix/bounce[27154]: 7A0F5C01060B7: sender non-delivery notification: 49211C01060B8 May 5 08:44:04 linden-d2 postfix/qmgr[26367]: 49211C01060B8: from=<>, size=2997, nrcpt=1 (queue active)
May 5 08:44:04 linden-d2 postfix/qmgr[26367]: 7A0F5C01060B7: removed
May 5 08:44:04 linden-d2 postfix/local[27156]: 49211C01060B8: to=clipemandfellem@server-cp.com, relay=local, delay=0.41, delays=0.03/0/0/0.37, dsn=2.0.0, status=sent (delivered to command: /usr/bin/procmail-wrapper -o -a $DOMAIN -d $LOGNAME)
May 5 08:44:04 linden-d2 postfix/qmgr[26367]: 49211C01060B8: removed May 5 08:44:13 linden-d2 dovecot: auth: Warning: auth client 0 disconnected with 1 pending requests: Connection reset by peer

I’m not sure what I need to do to solve this. Can anyone help?

I do use email for other virtual servers.

Many thanks,
Craig