Email accounts sending spam

Hello I have a few users on google apps that have been sending spam and and their reply address in the google app settings... I have them change their password and remove the wrong email address in the reply address ..... Would you have everyone in the company change their password or any other recommendations or would you take these as isolated incidents and no worries about the entire company
Deerek11Asked:
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Milind BhargavaCommented:
Changing passwords is the best, however this may also be due to those select employees having malware on their systems which infected outlook (if they are using it), they may have bad chrome plugins that could be behind this and may also be a bad spf record entry. Check all and let me know.

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Deerek11Author Commented:
I ran malwarebytes and it did locate one item it quarantine one item and requested a reboot,  then I reset chrome settings back to default. Also the user doesn't use outlook they use the browser just to log into their mail.  SPF record ... not sure how to check this?
Milind BhargavaCommented:
Run http://who.is/dns/<replace with domain name>
Under DNS records, look for a TXT record and check if it has something like v=spf1 +a +mx +ip4:
Deerek11Author Commented:
v=spf1 include:_spf.google.com ~all

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