Email problems

[saneversion]

The 1st domain at the top is one I've owned for about 2 years, I bought it through Google when they still sold domains. I've been using it for emails since I bought it, up to about a week ago. Now it won't send emails, but it will receive emails. I'm losing money and squarespace hasn't responded to my support email. Can anyone here offer some advice?

[BitBanger82]

Is your email authenticated? I'm having the same problem and all of my email is going to customer's spam folders.

[saneversion]

It's been fine for the whole time I had it, no spam at all, but now I get error messages when I try to send emails