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This Postfix build behaves differently from the upstream postfix-3.5.8.
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It's because in RHEL-8 backward compatibility is kept to postfix-3.3.1.
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For the upstream postfix-3.5.8 behavior either run the following commands:
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# postconf info_log_address_format=external
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# postconf smtpd_discard_ehlo_keywords=
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# postconf rhel_ipv6_normalize=yes
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Or go through the following steps:
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1. Change the configuration option 'info_log_address_format' to 'external'.
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In RHEL-8 it's by default set to 'internal' to mitigate [Incompat 20191109].
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2. Change the configuration option 'smtpd_discard_ehlo_keywords' to ''.
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In RHEL-8 it's by default set to 'chunking' to mitigate [Incompat 20180826].
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3. Add RHEL-8 specific configuration option 'rhel_ipv6_normalize' and set it
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to 'yes'. In RHEL-8 this option was added to mitigate [Incompat 20190427].
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Details from the upstream RELEASE_NOTES:
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[Incompat 20191109]
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Postfix daemon processes now log the from= and
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to= addresses in external (quoted) form in non-debug logging (info,
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warning, etc.). This means that when an address localpart contains
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spaces or other special characters, the localpart will be quoted,
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for example:
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from=<"name with spaces"@example.com>
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Older Postfix versions would log the internal (unquoted) form:
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from=<name with spaces@example.com>
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The external and internal forms are identical for the vast majority
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of email addresses that contain no spaces or other special characters
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in the localpart.
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Specify "info_log_address_format = internal" for backwards
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compatibility.
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The logging in external form is consistent with the address form
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that Postfix 3.2 and later prefer for table lookups. It is therefore
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the more useful form for non-debug logging.
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[Incompat 20180826]
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The Postfix SMTP server announces CHUNKING (BDAT
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command) by default. In the unlikely case that this breaks some
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important remote SMTP client, disable the feature as follows:
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/etc/postfix/main.cf:
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# The logging alternative:
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smtpd_discard_ehlo_keywords = chunking
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# The non-logging alternative:
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smtpd_discard_ehlo_keywords = chunking, silent_discard
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See BDAT_README for more.
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[Incompat 20190427]
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Postfix now normalizes IP addresses received
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with XCLIENT, XFORWARD, or with the HaProxy protocol, for consistency
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with direct connections to Postfix. This may change the appearance
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of logging, and the way that check_client_access will match subnets
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of an IPv6 address.
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