By separate mail

A phrase that's often used in formal or professional settings!

"By separate mail" is a phrase that means "by a separate letter or package" or "in a separate communication". It's often used to indicate that something will be sent or communicated to someone in a separate manner, rather than being included with the current message or document.

For example:

• "Please send the payment instructions by separate mail to the address listed above."
• "We will send the confirmation letter by separate mail once the application is processed."

In general, "by separate mail" is used to convey that the information or document being referred to is important enough to warrant its own separate communication, rather than being included with other information.