Email Policy

EMAIL POLICY

Cassavant requires that all SMTP, inbound and outbound, conform to industry best practices. Due to requirements placed on the industry, we do not make exceptions to these; however we will work with companies experiencing SMTP issues to resolve the issues so that security and reliability are maintained.

  • SMTP TO Cassavant must be secured with TLS. Effective December 1st 2020 we no longer accept messages in plain text.
  • SMTP FROM Cassavant will only be permitted to remote servers over TLS and to servers with a Valid TLS certificate from a Trusted Certificate Authority.
  • TLS connections are only permitted over TLS version 1.2 or newer.
  • Sending e-mail server must provide a DNS Host Name in HELO or EHLO that is able to be looked up via public DNS servers.
  • Connecting IP address must have a valid and published PTR/Reverse DNS record that matches the name presented by the sending server.
  • Senders domain must have valid A, AAAA, or MX record in public DNS.
  • Senders domain name must have a published SPF record.
  • Sending and Receiving IP address should not have a bad reputation.
  • Sending domain(s) should not exist on any Real Time Block Lists.
  • Sending large attachments will likely result in the message being blocked. Please work with your contact at the company to obtain access to our Web Portal for secured file transfers.