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2

Don't use catchall email accounts.


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Your server is probably not sending these messages, but you should check the messages headers and your maillogs to be sure. These messages are probably backscatter from joe jobbing spammers. SPF is probably the quickest way to mitigate this, though DKIM is arguably better. (You can do both.)


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A couple of possible solutions come to mind: If you are only ever sending email to yourself, you may be able to whitelist your own server on the recipient side (not through SPF). Having a contact form on your web site does not actually necessitate that it's your own web server that also delivers the email; there are plenty of service providers for ...


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The suggestion solution has the potential to work on stopping spam for awhile but it's not really an effective one, all it takes is for one of your users to register the email in a distribution list online and they'll start receiving spam again. You'll also create problems for end users who are going to send/receive emails from that address, it's not user ...


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Untrusted TLS connection established to gmail-smtp-in.l.google.com I think you have a certificate chain error here. Make sure you are sending the intermediate certificate along with your certificate.


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@Stefan You seem very knowledgeable which is awesome, I looked over your headers, without your domain name it makes it very hard to help troubleshoot. The one thing I did notice in your headers is that you're using "Simple/Simple" to sign your DKIM, you should really switch that over to "Relaxed/Relaxed". A lot of mail servers have trouble with simple. ...



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