Is there a RCPT limit for submission?

When I'm sending a message to a lot of people via submission to
127.0.0.1:25, is there a limit to the number of RCPT TO commands per
message, or the number of messages I can send per session?

In the FM I see the confMAX_MESSAGE_SIZE parameter for max message
size, and outgoing limits like SMTP_MAILER_MAXMSGS but not those two.

(If it's in the documentation and I missed it, after you tell me I'm
stupid I'd appreciate more hints on where to look.)

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