Hi all, I'm having issues receiving emails on one of the three domains I have setup on my server. I'm currently on 14.04.5, setup using the Perfect Server (https://www.howtoforge.com/perfect-...2-php-mysql-pureftpd-bind-dovecot-ispconfig-3) a couple of years ago. I have 3 domains on it, 2 of which are completely normal, and everything works well on those. The third I have setup for my wifes' travel agent site. With this, I host the email and DNS, however, the actual website is hosted by the company she's under. So, the WWW goes to their 34.x.x.x site, however, the email goes to my 75.x.x.x site. Every test that I can think of, from mail-tester.com to mxtoolbox.com to dnsstuff.com to network-tools.com claims that email should be working ok. But my wife has been receiving notes from her clients that their emails are bouncing, or getting delayed (and cancelled eventually). I've been pounding my head for the last month attempting to figure out either a fix, or a workaround for her problem. Attached is a screenshot of the DNS configuration in ISPConfig. Any ideas?