Virus-like returned emails in Mail

I use Mail 1.3.11(v622) on OS X V.10.3.9.
Recently I have started to receive emails that are supposedly bounced back to me, although I haven't sent emails to the addresses they have bounced back from.
The message I receive is as follows:
"SMTP_Error []
I'm afraid I wasn't able to deliver your message.
This is a permanent error; I've given up. Sorry it didn't work out.
The full mail-text and header is attached!"
The emails usually come with an attachment "mail.zip" or "mail_body.zip".
I use Pacific.Net as my online server. Is it a problem with Mail or pacific.net? It seems like the virus problems I have encountered on Microsoft Outlook on PCs. Could it be a virus?
Also, one of my regular email recipients tells me that she is not receiving my emails and that when she tries to email me it bounces back with a message about "virus protection".
Help, please!

More than likely, the attachment included with these bogus return email messages are infected with a Windows virus and if opened on a Mac, can cause no harm.
Since an authentic bounced message from a recipient's incoming mail server does not contain,
I'm afraid I wasn't able to deliver your message.
This is a permanent error; I've given up. Sorry it didn't work out.
these messages are either spam or a Windows user has been infected with a virus who has your email address in their address book. The virus sends an email (with infected file attached) to every contact in the infected user's address book and randomly selects a contact's address from their address book to appear as the sending email address for the message or messages. This occurs without the infected user's knowledge.
This method enables the virus to spread quickly since the majority of users are more inclined to open an attachment received from someone they recognize and/or the message received does not appear as spam. This message also appears to be a problem the recipient needs to address so they open the attachment and get infected.
Recently, I received the identical message 4 times with my POP account provided by my ISP and each message appeared to be sent by a different email address. I forwarded these messages (with long headers shown) to my ISP and within a couple of days, I received a message from my ISP indicating they blocked the sender's IP address from being able to send messages to my ISP's domain. All 4 messages were sent by the same computer/IP address so these were determined to be spam that happened to contain an attachment infected with a Windows virus.
Although these attachments can cause no harm to your Mac, contact your ISP about forwarding the messages to your ISP with long headers shown so they can determine if all messages were sent by the same computer IP address (if your ISP provides such a feature) or mark the messages as spam and then delete them.
Also, one of my regular email recipients tells me that she
is not receiving my emails and that when she tries to email
me it bounces back with a message about "virus protection".
Does this regular email recipient have a Hotmail address and is the recipient a Windows user?
If messages sent by this person are being bounced back by the incoming mail server for your account, you need to contact your ISP or email account provider.

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