This guide will help you troubleshoot the issue if you receive a message after sending an email indicating that it was rejected due to "Spam Message Rejected" or "5.7.0 AV: Message is rejected by headers rule filter.. 554 Please check the message and try again" ...

Important checks to perform

Make sure your email does not contain:

• words or phrases that are often associated with spam, as it could be identified as unwanted and rejected
• any unusual information in the signature, a link that is incorrectly formatted (http//.domain.xyz for example), etc.
• an attachment with one of these prohibited extensions: .exe, .com, .cmd, .cpl, .hta, .scf, .sct, .lnk, .bat, .js, .jse, .wsh, .ws, .wsf, .wsc, .vbe, .vb, .vbs, .shs, .pif, .scr ... including inside a compressed file (.zip for example)

To send a file (js or exe for example) and confirm that it does not contain viruses, store it in your hosting space and link to it (if the file is large and you are sending it from the Infomaniak Mail web app (online service ksuite.infomaniak.com/mail), it will be placed on a temporary server to allow your recipient to receive a download link) or via Swisstransfer.com.

Also, check your SPF record. If your domain does not have an SPF record or if this record is incorrect, your message will most likely be rejected.

If you believe you are receiving a "Spam Message Rejected" message without reason, contact Infomaniak support.