Summary of SmartRelay constraints

You should consider the following constraints when setting up and using SmartRelay:

  • SmartRelay imposes a one recipient per message limitation for injected messages

    A message can be sent to only one RCPT TO address. Note that To:, Cc: and Bcc: headers are not applicable to SMTP.

    See Supported email messages for more details.

  • SmartRelay imposes a limit on the number of simultaneous SMTP connections between your local SMTP forwarder and your dedicated SMTP listener

    See Maximum number of simultaneous SMTP sessions for more details.

  • By default, we apply an inbound rate limit of approximately one message each second, around 100,000 messages each day

See Inbound rate limiting at the SMTP listener for more details.

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