What does this email mean?

[bschultz]

Transcript of session follows.

Out: 220 mail.mydomain.com ESMTP Postfix (Debian/GNU)
In: EHLO mx3.pop.pl
Out: 250-mail.mydomain.com
Out: 250-PIPELINING
Out: 250-SIZE 10240000
Out: 250-VRFY
Out: 250-ETRN
Out: 250-STARTTLS
Out: 250-AUTH PLAIN LOGIN
Out: 250-AUTH=PLAIN LOGIN
Out: 250-ENHANCEDSTATUSCODES
Out: 250-8BITMIME
Out: 250 DSN
In: STARTTLS
Out: 454 4.3.0 TLS not available due to local problem
In: MAIL FROM:<>
Out: 250 2.1.0 Ok
In: RCPT TO:<not_me@mydomain.com>
Out: 550 5.1.1 <not_me@mydomain.com>: Recipient address rejected: User
unknown in virtual mailbox table
In: QUIT
Out: 221 2.0.0 Bye

[falko]

Your system doesn't know not_me@mydomain.com. Did you set up a mail account for this user?

[bschultz]

So does that mean that someone tried to send an email to a fake address at my domain...I wasn't doing anything with the server or testing any email accounts when this email was sent to the root user address.

[falko]

Transcript of session follows.

Out: 220 mail.mydomain.com ESMTP Postfix (Debian/GNU)
In: EHLO mx3.pop.pl
Out: 250-mail.mydomain.com
Out: 250-PIPELINING
Out: 250-SIZE 10240000
Out: 250-VRFY
Out: 250-ETRN
Out: 250-STARTTLS
Out: 250-AUTH PLAIN LOGIN
Out: 250-AUTH=PLAIN LOGIN
Out: 250-ENHANCEDSTATUSCODES
Out: 250-8BITMIME
Out: 250 DSN
In: STARTTLS
Out: 454 4.3.0 TLS not available due to local problem
In: MAIL FROM:<>
Out: 250 2.1.0 Ok
In: RCPT TO:<not_me@mydomain.com>
Out: 550 5.1.1 <not_me@mydomain.com>: Recipient address rejected: User
unknown in virtual mailbox table
In: QUIT
Out: 221 2.0.0 Bye
But wasn't that you trying to manually send a mail?

[bschultz]

no...that's why I was wondering what the email sent to the root email address was for. Did I get hacked...or is it something else?

[falko]

No, it doesn't mean that you got hacked. I guess someone tried to send a mail from the outside, maybe a spammer who was looking for open relays.