On Tue, Jan 12, 2021 at 12:36:58PM -0800, sckall...@yahoo.com wrote:

> Jan 12 17:56:26 mail postfix/smtpd[17788]: connect from xxx[127.0.0.1]
> Jan 12 17:56:26 mail postfix/smtpd[17788]: AED108DFA2: client=xxx[127.0.0.1]
> Jan 12 17:56:28 mail postfix/cleanup[17791]: AED108DFA2: 
> message-id=<2f18001d6e499$48eeff40$daccfdc0$@xxx>
> Jan 12 17:56:51 mail postfix/qmgr[4667]: AED108DFA2: from=<xxx>, 
> size=35379321, nrcpt=1 (queue active)
> Jan 12 17:56:51 mail postfix/smtpd[17788]: disconnect from xxx[127.0.0.1]
> Jan 12 17:56:51 mail postfix/smtp[18159]: AED108DFA2: to=<x...@icloud.com>, 
> relay=mx02.mail.icloud.com[17.57.152.14]:25, delay=25, delays=25/0.01/0.4/0, 
> dsn=5.3.4, status=bounced (message size 35379321 exceeds size limit 28311552 
> of server mx02.mail.icloud.com[17.57.152.14])
> Jan 12 17:56:51 mail postfix/bounce[18161]: AED108DFA2: sender non-delivery 
> notification: A0E418DFA4
> Jan 12 17:56:51 mail postfix/qmgr[4667]: AED108DFA2: removed

The message was created by something other than local submission, since
it arrived via SMTP to 127.0.0.1.

> Jan 12 17:56:51 mail postfix/cleanup[17853]: A0E418DFA4: 
> message-id=<20210112175651.A0E418DFA4@xxx>
> Jan 12 17:56:51 mail postfix/qmgr[4667]: A0E418DFA4: from=<>, size=3867, 
> nrcpt=1 (queue active)
> Jan 12 17:56:51 mail postfix/lmtp[17867]: A0E418DFA4: to=<xxx>, 
> orig_to=<xxx>, relay=xxx[/var/lib/imap/socket/lmtp], delay=0.05,
> delays=0.01/0.02/0/0.02, dsn=2.1.5, status=sent (250 2.1.5 Ok 
> SESSIONID=<xxx-17946-1610474211-1-15717393109624973811>)
> Jan 12 17:56:51 mail postfix/qmgr[4667]: A0E418DFA4: removed

The bounce is delivered to via LMTP, perhaps to a mailbox, so the
message has a local sender?

> The bounces are ordinary. Here is one seen on the client:

You're showing only the irrelevant portion of the bounce. What
matters is the full headers of the returned message.

> -----------------------------------------------------
> Reporting-MTA: dns; xxx
> X-Postfix-Queue-ID: 528F8C5AC4
> X-Postfix-Sender: rfc822; xxx
> Arrival-Date: Tue, 12 Jan 2021 19:58:22 +0000 (UTC)
> 
> Final-Recipient: rfc822; x...@icloud.com
> Original-Recipient: rfc822;x...@icloud.com
> Action: failed
> Status: 5.3.4
> Diagnostic-Code: X-Postfix; message size 35379321 exceeds size limit 28311552 
> of server mx01.mail.icloud.com[17.56.9.17]
> -----------------------------------------------------------

The third part of the message is the content, which will have
the full set of "Received" headers that show how the message
got to the point at which it bounced.

-- 
    Viktor.

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