On Wed, 28 Nov 2018, Viktor Dukhovni wrote:

# postconf |grep limitrec
limitrecip_destination_recipient_limit = 3

   * Evidence that the nexthop destination domain (not the MX host, but
     the envelope recipient domain) is routed to the "limitrecip" transport.

In transport file:

yahoo.com       limitrecip:
yahoo.it        limitrecip:
yahoodns.net    limitrecip:
mx-eu.mail.am0.yahoodns.net     limitrecip:

And how is Postfix configured to use this transport file?

:-)
Difference between a Pro (you) and a part-time mail administrator (me that manage postfix config few times for year ...):
I assumed that it was enabled by default ...

Now I have in main.cf:
transport_maps = hash:/etc/postfix/transport
limitrecip_destination_recipient_limit = 3

and in master.cf:
limitrecip  unix -       -       n       -       -       smtp


Yes, all 7 recipients were in the same "envelope", so the recipient_limit
was not applied, which suggests that the transport settings were
not in effect.

The settings apply to already queued messages or only for new messages?

With the corrected settings I have similar result:

Nov 29 13:20:40 ls postfix/qmgr[22205]: B9899396281A: from=<users-boun...@list.rfx.it>, size=234000, nrcpt=50 (queue active) Nov 29 13:20:40 ls postfix/smtp[23237]: B9899396281A: host mx-eu.mail.am0.yahoodns.net[212.82.101.46] said: 451 Message temporarily deferred - Abaca (in reply to end of DATA command) Nov 29 13:20:41 ls postfix/smtp[23245]: B9899396281A: host mx-eu.mail.am0.yahoodns.net[188.125.73.87] said: 451 Message temporarily deferred - Abaca (in reply to end of DATA command) Nov 29 13:20:41 ls postfix/smtp[23235]: B9899396281A: host mx-eu.mail.am0.yahoodns.net[212.82.101.46] said: 451 Message temporarily deferred - Abaca (in reply to end of DATA command) Nov 29 13:20:41 ls postfix/smtp[23245]: B9899396281A: to=<us...@yahoo.it>, relay=mx-eu.mail.am0.yahoodns.net[212.82.101.46]:25, delay=166368, delays=166367/0/0.63/0.35, dsn=4.0.0, status=deferred (host mx-eu.mail.am0.yahoodns.net[212.82.101.46] said: 451 Message temporarily deferred - Abaca (in reply to end of DATA command)) Nov 29 13:20:41 ls postfix/smtp[23245]: B9899396281A: to=<us...@yahoo.it>, relay=mx-eu.mail.am0.yahoodns.net[212.82.101.46]:25, delay=166368, delays=166367/0/0.63/0.35, dsn=4.0.0, status=deferred (host mx-eu.mail.am0.yahoodns.net[212.82.101.46] said: 451 Message temporarily deferred - Abaca (in reply to end of DATA command)) Nov 29 13:20:41 ls postfix/smtp[23245]: B9899396281A: to=<us...@yahoo.it>, relay=mx-eu.mail.am0.yahoodns.net[212.82.101.46]:25, delay=166368, delays=166367/0/0.63/0.35, dsn=4.0.0, status=deferred (host mx-eu.mail.am0.yahoodns.net[212.82.101.46] said: 451 Message temporarily deferred - Abaca (in reply to end of DATA command)) Nov 29 13:20:41 ls postfix/smtp[23235]: B9899396281A: to=<us...@yahoo.it>, relay=mx-eu.mail.am0.yahoodns.net[188.125.73.87]:25, delay=166368, delays=166367/0/0.78/0.39, dsn=4.0.0, status=deferred (host mx-eu.mail.am0.yahoodns.net[188.125.73.87] said: 451 Message temporarily deferred - Abaca (in reply to end of DATA command)) Nov 29 13:20:41 ls postfix/smtp[23235]: B9899396281A: to=<us...@yahoo.it>, relay=mx-eu.mail.am0.yahoodns.net[188.125.73.87]:25, delay=166368, delays=166367/0/0.78/0.39, dsn=4.0.0, status=deferred (host mx-eu.mail.am0.yahoodns.net[188.125.73.87] said: 451 Message temporarily deferred - Abaca (in reply to end of DATA command)) Nov 29 13:20:41 ls postfix/smtp[23235]: B9899396281A: to=<us...@yahoo.it>, relay=mx-eu.mail.am0.yahoodns.net[188.125.73.87]:25, delay=166368, delays=166367/0/0.78/0.39, dsn=4.0.0, status=deferred (host mx-eu.mail.am0.yahoodns.net[188.125.73.87] said: 451 Message temporarily deferred - Abaca (in reply to end of DATA command)) Nov 29 13:20:42 ls postfix/smtp[23237]: B9899396281A: to=<us...@yahoo.it>, relay=mx-eu.mail.am0.yahoodns.net[188.125.73.87]:25, delay=166368, delays=166367/0/0.62/0.4, dsn=4.0.0, status=deferred (host mx-eu.mail.am0.yahoodns.net[188.125.73.87] said: 451 Message temporarily deferred - Abaca (in reply to end of DATA command))

Thanks for your hints.
B.

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