Hi all
I have an older 5.2 server used for email. (yes plan to upgrade soon...)
We are getting a lot of nuisance emails that use spoofed but valid email addresses from our own domain, where the message is from and to the same address. I can view the header and see that the message originates from outside. I can also see in the mail log the message comes from off-site.
Is there an easy fix to check and block emails that have valid sender address, but come from outside our domain?
thanks
K
I have an older 5.2 server used for email. (yes plan to upgrade soon...)
We are getting a lot of nuisance emails that use spoofed but valid email addresses from our own domain, where the message is from and to the same address. I can view the header and see that the message originates from outside. I can also see in the mail log the message comes from off-site.
Is there an easy fix to check and block emails that have valid sender address, but come from outside our domain?
thanks
K
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Responses (3)
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Accepted Answer
Hi,
Defining DMARC or SPF policies on your DNS is one thing. If you want your mail system taking these into account receiving inbound messages, you'll need some additional configuration.
postfix-policyd-spf-python should be able to deal with SPF validation, while opendmarc should be able to cope with DMARC validation.
Using postfix and dovecot, this post should apply to your case: -
Accepted Answer
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Accepted Answer
Have a look in this HowTo. The section at the end should be applicable to 5.x but I can't test as I don't have an 5.x machines and I really should encourage you to upgrade.
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