Interpret /var/spool/mqueue entries

[Rob Belics]

I thought this was a solved problem in my sendmail configuration but, over the last few days, I've gotten some entries and I've forgotten how to interpret them. To me, it appears that the first two entries show that I'm relaying some mail and it was refused by the receiver. But I'm wondering if someone is impersonating my email address and that is why I'm getting a bounce back.

Is that right? What should I check in sendmail configuration? Note that I changed my email in the examples below to me at example.com

 Mail in local queue:
                /var/spool/mqueue (4 requests)
-----Q-ID----- --Size-- -----Q-Time----- ------------Sender/Recipient-----------
09V3c6st046407     5478 Fri Oct 30 22:38 MAILER-DAEMON
                 (Deferred: Connection refused by mail.distinctionspots.com.)
                                         <kn95_masks-me=example.com at distinction
09V2c6st082929     9067 Fri Oct 30 21:38 MAILER-DAEMON
                 (Deferred: Connection refused by mail.enlighteneduponhearing.)
                                         <besthealth-rates-me=example.com at enlig
09UNHHsv062419     2449 Fri Oct 30 18:17 <kn95_masks-me=example.com at distinctions
          7BIT   (Deferred: 421-4.7.0 [107.161.21.234      15] Our system has )
                                         <me at example.com>
09UMHcc1059037     5901 Fri Oct 30 17:17 <besthealth-rates-me=example.com at enligh
          7BIT   (Deferred)
                                         <me at example.com>