First Interstate Bank has partnered with Mimecast to communicate securely with you by email. Secure mail transmits encrypted messages that only authorized recipients can access.
A recipient of a Registered Envelope must create a password with Secure Mail (free of charge) for opening encrypted messages. When you receive your first Secure Mail, another email with an initial password will arrive from email@example.com.
Any Registered Envelopes you receive after this point will contain a link to our Secure Mail Portal. This portal will contain any secure messages received in the last 90 days. In addition, you can reply securely or compose a new secure mail to any bank employee. Secure messages will expire after 90 days.