If you use virtual address for your account through here is the command to see if the mail is getting bounced because you gave the email to someone but forgot to link it virtually to your account.

$ grep 'User unknown in virtual mailbox table' /var/log/mail.log | sed -e 's/.*to=<//g' | sed -e 's/>.*//g' | sort -t: -u -k1,1

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