how to stop Contact us spam

[Saurabh Jain]

 

getting email like this from last ten days

 

from 3 to 4  different email address 

but same website ad 

[Adriano Faria]

Maybe use a captcha:

 

[Makoto]

I do wish captcha was supported natively on the contact us forum.

Unfortunately most of the spam I get is manually entered from shady ad companies promising to make me tons of money so that's still a problem no matter what I do lmao.

[b416]

What do you use to receive mail? 

In postfix you can filter out a lot of spam using known blacklists and some tweaks, for example this is what I have and I see a lot of rejections in the logs : 

 

smtpd_recipient_restrictions =
    permit_sasl_authenticated
    reject_non_fqdn_recipient
    reject_unknown_recipient_domain
    check_policy_service unix:private/policyd-spf
    reject_rbl_client clients.rbl.gcolpart.com
    reject_rbl_client zen.spamhaus.org
    reject_rbl_client b.barracudacentral.org
    reject_rbl_client cbl.abuseat.org
    reject_rbl_client zen.spamhaus.org
    reject_rbl_client bl.spamcop.net