Strange problem while emailing with my domain name inside it

I'm facing a weird (for me at least) problem. When I'm trying send emails using my hosting's smtp and including a specific domain name (let's say www.abc.com) inside the email, the emails aren't being sent at all. Not even in the spams. Emails from the same smtp with other domain names deliver just fine.

Anyone has any ideas why this might be happening? Thanks in advance.

Do you have any email filters setup in your hosting account?

Mountaineer said:

Do you have any email filters setup in your hosting account?

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I don't think so. I'll try to be sure though.