Attached with the mail

It seems like you're referring to a document or file that is being sent along with an email. In that case, you can use the phrase "attached to this email" or "attached with this mail" to indicate that the document is being sent as a file attachment.

For example:

Alternatively, you can also use the phrase "please find attached" or "attached please find" to make it clear that the document is being sent as a file attachment.

For example:

I hope that helps!