Spammers use my client's email addres

Appearantly, spammers use my clients email
address in the From: field to send emails.

Consequently, when the emails are bounced,
they go to my client's mailbox.

Hence the mailbox is getting bigger and
bigger. Furthermore, my server's bandwidth is
wasted. Spammers use my client's email addres

So, how to solve this problem?

Any suggestions will be appreciated.

Thanks.

 

 

 

 

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