Mailing Issues

I’ve come across an issue where one of my clients suddenly stopped receiving emails from his website contact form. ┬áChecking various blacklists can sometimes result in the solution: https://www.spamhaus.org/lookup/ http://www.abuseat.org/lookup.cgi However, in this case, the client manages his own domain and mail. ┬áThe zone file for the domain in question looks like this: A “mail”…