Suddenly emails not being sent to our domain

Your email is probably being seen as spam somewhere in the email process. This is usually due to email headers (in particular the From email address used) or email content.

See Contact Form 7 Email Issues – this links to a much more comprehensive article which also covers emails being considered spam.

See also Best Practice to Set Up Mail.

Important to remember there are a lot of places, other than your spam folder, where emails can be trapped as spam.

Create your domain email (like [email protected]), then install Easy SMTP Mail
And change settings to your smtp.
It’s your pill from spamfilters =)