I am trying to figure out what is going on with my email signature. I use a file containing an HTML-coded signature.

Server is Microsoft Exchange.

If I send an email to anyone within my same domain, signature configuration is preserved. But if I send the exact same email to anyone outside this domain (gmail, hotmail, etc), then the signature loses configuration.

Now, if I send an email from my gmail account, instead of exchange, and I use the exact same HTML signature, then the signature configuration is preserved no matter whether the recipient is gmail or any other domain.

Any insight what might be going wrong here?

-- Thank you