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Are people trying to relay mail through my system?

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My /var/log/.exim4/log file is flooded with messages such as shown 
below. I'm not trying to send mail to any of those .co or .com 
addresses. I use my ISP (shaw.ca cable provider) as a smarthost.

Are people trying to use my system as a relay? If so, can I block them 
without cutting myself off from remote access to the IMAP server I run 
on my system?

Sorry if I sound lame. I set this up over 20 years ago and haven't done 
anything to it since.

2023-09-24 20:48:37 1qkRDH-001Zqh-1Z == 
6626-879-8427-40-rickm=timshel.ca@mail.purecuresol.co R=smarthost 
T=remote_smtp_smarthost defer (-54): retry time not reached for any host 
for 'mail.purecuresol.co'
2023-09-24 20:48:37 1qkOYj-001Hnf-2V == 
6595-611-17423-903-rickm=timshel.ca@mail.turntext.co R=smarthost 
T=remote_smtp_smarthost defer (-54): retry time not reached for any host 
for 'mail.turntext.co'
2023-09-24 20:48:37 1qkLEb-000vn2-2D == 
bounce+c764ac.103fa-rickm=timshel.ca@inputhealth.com R=smarthost 
T=remote_smtp_smarthost defer (-54): retry time not reached for any host 
for 'inputhealth.com'
2023-09-24 20:48:37 1qk8eb-00HQEW-2o == 
bounce+c764ac.103fa-rickm=timshel.ca@inputhealth.com R=smarthost 
T=remote_smtp_smarthost defer (-54): retry time not reached for any host 
for 'inputhealth.com'
2023-09-24 20:48:37 1qkRGA-001aA2-2k == 
6613-452-119912-590-rickm=timshel.ca@mail.ikariacool.co R=smarthost 
T=remote_smtp_smarthost defer (-54): retry time not reached for any host 
for 'mail.ikariacool.co'
2023-09-24 20:48:37 1qkDDB-000ChQ-2S == 
bounce+c764ac.103fa-rickm=timshel.ca@inputhealth.com R=smarthost 
T=remote_smtp_smarthost defer (-54): retry time not reached for any host 
for 'inputhealth.com'
2023-09-24 20:48:37 1qkZIY-002gsG-0D == 
6613-452-119912-590-rickm=timshel.ca@mail.ikariacool.co R=smarthost 
T=remote_smtp_smarthost defer (-54): retry time not reached for any host 
for 'mail.ikariacool.co'

Rick

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Thread

Are people trying to relay mail through my system? Rick Macdonald <rickmacd@shaw.ca> - 2023-09-25 05:00 +0200
  Re: Are people trying to relay mail through my system? Michael Kjörling <2695bd53d63c@ewoof.net> - 2023-09-25 16:40 +0200
    Re: Are people trying to relay mail through my system? Rick Macdonald <rickmacd@shaw.ca> - 2023-09-25 20:40 +0200
  Re: Are people trying to relay mail through my system? Andy Smith <andy@strugglers.net> - 2023-09-25 18:10 +0200
    Re: Are people trying to relay mail through my system? Rick Macdonald <rickmacd@shaw.ca> - 2023-09-25 20:30 +0200
      Re: Are people trying to relay mail through my system? Michael Kjörling <2695bd53d63c@ewoof.net> - 2023-09-25 20:50 +0200
        Re: Are people trying to relay mail through my system? Rick Macdonald <rickmacd@shaw.ca> - 2023-09-25 22:40 +0200
      Re: Are people trying to relay mail through my system? Andy Smith <andy@strugglers.net> - 2023-09-25 22:30 +0200
      Re: Are people trying to relay mail through my system? Andy Smith <andy@strugglers.net> - 2023-09-25 22:30 +0200
        Re: Are people trying to relay mail through my system? Rick Macdonald <rickmacd@shaw.ca> - 2023-09-25 23:00 +0200
          Re: Are people trying to relay mail through my system? Rick Macdonald <rickmacd@shaw.ca> - 2023-09-26 01:00 +0200
            Re: Are people trying to relay mail through my system? Greg Wooledge <greg@wooledge.org> - 2023-09-26 01:20 +0200
              Re: Are people trying to relay mail through my system? Rick Macdonald <rickmacd@shaw.ca> - 2023-09-26 03:50 +0200
              Re: Are people trying to relay mail through my system? Curt <curty@free.fr> - 2023-09-26 16:40 +0200

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