I can't receive email from lastpass.com

I use lastpass.com to share passwords with a family member. When we try to do that, we never get the email.

It worked last in April but not since.

Lastpass reports a bounce with the following error:

to=, relay=mx.zoho.com[204.141.42.121]:25, delay=2.2, delays=0.24/0/1/0.98, dsn=5.2.3, status=bounced (host mx.zoho.com[204.141.42.121] said: 554 5.2.3 MailPolicy violation Error delivering to mailboxes (in reply to end of DATA command))

Subject: LastPass Email Verification

Domain sender: do-not-reply-support@lastpass.com

Any ideas?

I have no domain rules or client rules that would affect this as far as I can tell.

Thanks,

-John