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293806Re: Semi-OT: Exchange 2013 SMTP Callout

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  • Wietse Venema
    Jun 14, 2013
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      Bernhard Schmidt:
      > This gets even worse when the mail has two recipients ... doesnotexist@
      > does not exist, t1@ does...
      >
      > mail from: <test@...>
      > 250 2.1.0 Sender OK
      > rcpt to: <doesnotexist@...>
      > 250 2.1.5 Recipient OK
      > rcpt to: <t1@...>
      > 250 2.1.5 Recipient OK
      > data
      > 354 Start mail input; end with <CRLF>.<CRLF>
      > test
      > .
      > 550 5.1.1 User unknown
      >
      > mail from: <test@...>
      > 250 2.1.0 Sender OK
      > rcpt to: <t1@...>
      > 250 2.1.5 Recipient OK
      > data
      > 354 Start mail input; end with <CRLF>.<CRLF>
      > test
      > .
      > 250 2.6.0 <MSGID> [InternalId=2740189134859] Queued mail for delivery
      >
      > This is not only unusable for Recipient validation, but will reject
      > legitimate mail since you cannot reject individual recipients in DATA
      > with SMTP.

      That is really awful. Your gateway will need to use smtp_recipient_limit=1
      for all inbound mail (whether a RAV probe message or not). As for
      people who have to expose their Exchange 2013 server to the Internet
      there is no such workaround.

      Wietse
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