sendmail limits

Giorgos Keramidas keramida at
Tue Mar 10 03:38:20 PDT 2009

On Tue, 10 Mar 2009 08:51:12 +0100 (CET), Wojciech Puchar <wojtek at> wrote:
> i'm just asking for sure - do sendmail has any limits of how much
> adresses is put in CC/BCC in single mail?

Yes, of course.  There is *support* for a limit, but the default
is to accept a large number of recipients per-message:

  confMAX_RCPTS_PER_MESSAGE  MaxRecipientsPerMessage

      [default: infinite] If set, allow no more than the specified
      number of recipients in an SMTP envelope.  Further recipients
      receive a 452 error code (i.e., they are deferred for the
      next delivery attempt).

You can set this easily, by modifying `' to include:

  define(`confMAX_RCPTS_PER_MESSAGE', `20')

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