sendmail version:

Version 8.15.2
Compiled with: DNSMAP IPV6_FULL LDAPMAP LDAP_REFERRALS LOG MAP_REGEX
MATCHGECOS MILTER MIME7TO8 MIME8TO7 NAMED_BIND NETINET NETINET6
NETUNIX NEWDB PIPELINING SASLv2 SCANF SOCKETMAP STARTTLS
TCPWRAPPERS USERDB USE_LDAP_INIT XDEBUG
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Just installed sendmail from ubuntu apt repo
when I ask the status of the freshly started emacs I see.

I'm sorry to through so much data out there but I hope someone is
willing to go through some of it. As must be obviouse I'm in dire
need of some coaching pointers URLS etc.
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systemctl status sendmail.service

root # systemctl status sendmail.service
● sendmail.service - LSB: powerful, efficient, and scalable Mail Transport Agent
Loaded: loaded (/etc/init.d/sendmail; generated)
Active: active (exited) since Sun 2023-03-26 17:51:57 UTC; 1h 20min ago
Docs: man:systemd-sysv-generator(8)
CPU: 204ms

Mar 26 17:52:19 uw sm-mta[199282]: daemon MSA: problem creating SMTP socket
Mar 26 17:52:25 uw sm-mta[199282]: NOQUEUE: SYSERR(root): opendaemonsocket:
daemon MSA: cannot bind: Address already in use

Mar 26 17:52:25 uw sm-mta[199282]: daemon MSA: problem creating SMTP socket
Mar 26 17:52:30 uw sm-mta[199282]: NOQUEUE: SYSERR(root): opendaemonsocket:
daemon MSA: cannot bind: Address already in use

Mar 26 17:52:30 uw sm-mta[199282]: daemon MSA: problem creating SMTP socket
Mar 26 17:52:35 uw sm-mta[199282]: NOQUEUE: SYSERR(root): opendaemonsocket:
daemon MSA: cannot bind: Address already in use

Mar 26 17:52:35 uw sm-mta[199282]: daemon MSA: problem creating SMTP socket
Mar 26 17:52:40 uw sm-mta[199282]: NOQUEUE: SYSERR(root): opendaemonsocket:
daemon MSA: cannot bind: Address already in use

Mar 26 17:52:40 uw sm-mta[199282]: daemon MSA: problem creating SMTP socket
Mar 26 17:52:40 uw sm-mta[199282]: NOQUEUE: SYSERR(root): opendaemonsocket:
daemon MSA: server SMTP socket wedged: exiting

all seems to be pointing to something pretty badly wrong with submit.cf

I've included the current submit.mc and sendmail.mc.

m4'ing was done after conclusion of editing

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I mainly used these pages to try to get started

https://netcorecloud.com/tutorials/install-sendmail-server-centos-7/
https://mailoutgoing.com/support/mailrelay/sendmail.html
https://www.oreilly.com/library/view/linux-network-administrators/1565924002/ch18s08.html

I didn't find much in those about editing submit.mc but took a few
tips seen in the submit.mc below startup messages.

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submit.mc
------- ------- ---=--- ------- -------

divert(-1)dnl
#-----------------------------------------------------------------------------
# $Sendmail: submit.mc,v 8.15.2 2021-12-09 00:18:01 cowboy Exp $
# # Copyright (c) 2000-2010 Richard Nelson. All Rights Reserved.
# # cf/debian/submit.mc. Generated from submit.mc.in by configure.
# # submit.mc prototype config file for building Sendmail 8.15.2
# # Note: the .in file supports 8.15.0 - 9.0.0, but the generated
# file is customized to the version noted above.
# # This file is used to configure Sendmail for use with Debian systems.
# # If you modify this file, you will have to regenerate /etc/mail/submit.cf
# by running this file through the m4 preprocessor via one of the following:
# * make (or make -C /etc/mail)
# * sendmailconfig
# * m4 /etc/mail/submit.mc > /etc/mail/submit.cf
# The first two options are preferred as they will also update other files
# that depend upon the contents of this file.
# # The best documentation for this .mc file is:
# /usr/share/doc/sendmail-doc/cf.README.gz
# #-----------------------------------------------------------------------------
divert(0)dnl
# # Copyright (c) 2000-2002 Richard Nelson. All Rights Reserved.
# # This file is used to configure Sendmail for use with Debian systems.
# define(`_USE_ETC_MAIL_')dnl
include(`/usr/share/sendmail/cf/m4/cf.m4')dnl
VERSIONID(`$Id: submit.mc, v 8.15.2-22ubuntu3 2021-12-09 00:18:01 cowboy Exp $')
OSTYPE(`debian')dnl
DOMAIN(`debian-msp')dnl
dnl #
dnl #---------------------------------------------------------------------
dnl # Masquerading information, if needed, should go here
dnl # You likely will not need this, as the MTA will do it
dnl #---------------------------------------------------------------------
dnl MASQUERADE_AS()dnl
dnl FEATURE(`masquerade_envelope')dnl
dnl #
dnl #---------------------------------------------------------------------
dnl # The real reason we're here: the FEATURE(msp)
dnl # NOTE WELL: MSA (587) should have M=Ea, so we need to use stock 25
dnl #---------------------------------------------------------------------
FEATURE(`msp', `[127.0.0.1]', `25')dnl
dnl #
dnl #---------------------------------------------------------------------
dnl # Some minor cleanup from FEATURE(msp)
dnl #---------------------------------------------------------------------
dnl #
dnl #---------------------------------------------------------------------

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sendmail.mc
------- ------- ---=--- ------- -------
divert(-1)dnl
#-----------------------------------------------------------------------------
# $Sendmail: debproto.mc,v 8.15.2 2021-12-09 00:18:01 cowboy Exp $
# # Copyright (c) 1998-2010 Richard Nelson. All Rights Reserved.
# # cf/debian/sendmail.mc. Generated from sendmail.mc.in by configure.
# # sendmail.mc prototype config file for building Sendmail 8.15.2
# # Note: the .in file supports 8.15.0 - 9.0.0, but the generated
# file is customized to the version noted above.
# # This file is used to configure Sendmail for use with Debian systems.
# # If you modify this file, you will have to regenerate /etc/mail/sendmail.cf
# by running this file through the m4 preprocessor via one of the following:
# * make (or make -C /etc/mail)
# * sendmailconfi
# * m4 /etc/mail/sendmail.mc > /etc/mail/sendmail.cf
# The first two options are preferred as they will also update other files
# that depend upon the contents of this file.
# # The best documentation for this .mc file is:
# /usr/share/doc/sendmail-doc/cf.README.gz
# #-----------------------------------------------------------------------------
divert(0)dnl
# # Copyright (c) 1998-2005 Richard Nelson. All Rights Reserved.
# # This file is used to configure Sendmail for use with Debian systems.
# define(`_USE_ETC_MAIL_')dnl
include(`/usr/share/sendmail/cf/m4/cf.m4')dnl
VERSIONID(`$Id: sendmail.mc, v 8.15.2-22ubuntu3 2021-12-09 00:18:01 cowboy Exp $')
OSTYPE(`debian')dnl
DOMAIN(`debian-mta')dnl
dnl # Items controlled by /etc/mail/sendmail.conf - DO NOT TOUCH HERE
undefine(`confHOST_STATUS_DIRECTORY')dnl #DAEMON_HOSTSTATS=
dnl # Items controlled by /etc/mail/sendmail.conf - DO NOT TOUCH HERE
dnl #
dnl # General defines
dnl #
dnl # SAFE_FILE_ENV: [undefined] If set, sendmail will do a chroot()
dnl # into this directory before writing files.
dnl # If *all* your user accounts are under /home then use that
dnl # instead - it will prevent any writes outside of /home !
dnl # define(`confSAFE_FILE_ENV', `')dnl
dnl #
dnl # Daemon options - restrict to servicing LOCALHOST ONLY !!!
dnl # Remove `, Addr=' clauses to receive from any interface
dnl # If you want to support IPv6, switch the commented/uncommentd lines
dnl #
dnl ## ADDED by HP dnl
dnl ## HP from https://netcorecloud.com/tutorials/install-sendmail-server-centos-7/ dnl
define(`SMART_HOST', `smtp.fastmail.com')dnl
define(`RELAY_MAILER_ARGS', `TCP $h 587')dnl
define(`ESMTP_MAILER_ARGS', `TCP $h 587')dnl
dnl hp end ADDED dnl
TRUST_AUTH_MECH(`EXTERNAL DIGEST-MD5 CRAM-MD5 LOGIN PLAIN')dnl
define(`confAUTH_MECHANISMS', `EXTERNAL GSSAPI DIGEST-MD5 CRAM-MD5 LOGIN PLAIN')dnl
dnl hp Ditched the FEATURE authinfo .. although recommended at:dnl
dnl hp using access instead as recommended as working with any version sendmail dln
dnl hp see https://mailoutgoing.com/support/mailrelay/sendmail.html dnl
dnl hp FEATURE(`authinfo', `hash /etc/mail/auth/client-info.db')dnl
FEATURE(`access_db', `hash -T<TMPF> -o /etc/mail/access.db')dnl

DAEMON_OPTIONS(`Port=smtp, Name=MTA')dnl
DAEMON_OPTIONS(`Port=submission, Name=MSA, M=Ea, Addr=127.0.0.1')dnl
DAEMON_OPTIONS(`Port=smtps, Name=TLSMTA, M=s')dnl

dnl hp FEATURE(`no_default_msa')dnl
dnl DAEMON_OPTIONS(`Family=inet6, Name=MTA-v6, Port=smtp, Addr=::1')dnl
dnl DAEMON_OPTIONS(`Family=inet, Name=MTA-v4, Port=smtp, Addr=127.0.0.1')dnl
dnl DAEMON_OPTIONS(`Family=inet6, Name=MSP-v6, Port=submission, M=Ea, Addr=::1')dnl
dnl DAEMON_OPTIONS(`Family=inet, Name=MSP-v4, Port=submission, M=Ea, Addr=127.0.0.1')dnl
dnl #

dnl # Be somewhat anal in what we allow
define(`confPRIVACY_FLAGS',dnl
`needmailhelo,needexpnhelo,needvrfyhelo,restrictqrun,restrictexpand,nobodyreturn,authwarnings')dnl
dnl #
dnl # Define connection throttling and window length
define(`confCONNECTION_RATE_THROTTLE', `15')dnl
define(`confCONNECTION_RATE_WINDOW_SIZE',`10m')dnl
dnl #
dnl # Features
dnl #
dnl # use /etc/mail/local-host-names
FEATURE(`use_cw_file')dnl
dnl #
dnl # The access db is the basis for most of sendmail's checking
dnl FEATURE(`access_db', , `skip')dnl
dnl #
dnl # The greet_pause feature stops some automail bots - but check the
dnl # provided access db for details on excluding localhosts...
FEATURE(`greet_pause', `1000')dnl 1 seconds
dnl #
dnl # Delay_checks allows sender<->recipient checking
FEATURE(`delay_checks', `friend', `n')dnl
dnl #
dnl # If we get too many bad recipients, slow things down...
define(`confBAD_RCPT_THROTTLE',`3')dnl
dnl #
dnl # Stop connections that overflow our concurrent and time connection rates
FEATURE(`conncontrol', `nodelay', `terminate')dnl
FEATURE(`ratecontrol', `nodelay', `terminate')dnl
dnl #
dnl # If you're on a dialup link, you should enable this - so sendmail
dnl # will not bring up the link (it will queue mail for later)
dnl define(`confCON_EXPENSIVE',`True')dnl
dnl #
dnl # Dialup/LAN connection overrides
dnl #
include(`/etc/mail/m4/dialup.m4')dnl
include(`/etc/mail/m4/provider.m4')dnl
dnl #
dnl # Default Mailer setup
MAILER_DEFINITIONS
MAILER(`smtp')dnl
MAILER(`procmail')dnl