/usr/share/shorewall/macro.SMTP is in shorewall 4.5.21.6-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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# Shorewall version 4 - SMTP Macro
#
# /usr/share/shorewall/macro.SMTP
#
# This macro handles plaintext SMTP (email) traffic. For SMTP
# encrypted over SSL, use macro.SMTPS. Note that STARTTLS can be
# used over the standard STMP port, so the use of this macro
# doesn't necessarily imply the use of an insecure connection.
#
# Note: This macro handles traffic between an MUA (Email client)
# and an MTA (mail server) or between MTAs. It does not enable
# reading of email via POP3 or IMAP. For those you need to use
# the POP3 or IMAP macros.
#
###############################################################################
#ACTION SOURCE DEST PROTO DEST SOURCE RATE USER/
# PORT(S) PORT(S) LIMIT GROUP
PARAM - - tcp 25
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