Why has my mail account stopped working completely

Why has my mail account stopped working completely

So my email address with zoho has been working absolutely fine until I switched to wordpress.org and had to change stuff around a bit. I managed to chnge the MX records and get it working fine again. Suddenly it stopped receiving emails from twitter but would still receive them from everywhere else. Now it has completely packed up and won't receive any messages at all. I use this website for my business so it would be great if someone could help me try and solve this!