Weird Email Error -- Messages Not Going Through

[owatagal]

I'm getting some emails bounced -- this is the error message:

 

SMTP error from remote mail server after end of data:

host mx1.megamailservers.com [216.251.32.71]:

550 5.7.1 l1R1rYL9030736 This message does not comply with required standards.

 

I've tried Google, but I don't understand email protocols well enough to figure out what the various pages are saying. Anyone have any ideas what's going on here / if there's something I can fix so the emails DO comply with required standards?

[Head Guru]

You should submit a ticket. We would need the full headers to help you.

[owatagal]

Will do!