Dos_outlook_to_mx

Community Support
1

When sending email via Outlook using the server IMAP/SMTP which is relayed then to Amazon SES, there’s an spam marking on mail-tester saying “DOS_OUTLOOK_TO_MX Delivered direct to MX with Outlook headers”

Google says the following: “Both internal flags are harmless by themselves but their combination leads to DOS_OUTLOOK_TO_MX with high spam score. You need to check X-Mailer header of messages sent with PHPMailer. This header should be set to PHPMailer, not to Microsoft Outlook or something similar.”

Can it be forced through the panel to mark all email as PHPMailer or how do I avoid this spam marking while using Outlook?

This seems to be an issue with Thunderbird and Outlook, other email clients like Spike do not have this problem.

1 Like
2

hi,

Although it doesn’t seem to have much of an effect, it does produce an unpleasant result. Is there any setting for this?

3

Hello,

this problem has been solved.

When outgoing email is relayed through Amazon, it cleans the relevant headers.

begin transports

smtp_relay_smtp:

driver = smtp hosts_require_auth = $host_address

hosts_require_tls = $host_address

#below line has been added.

headers_remove = X-Mailer : X-Originating-IP : X-Antivirus : X-Antivirus-Status : X-PHP-Originating-Script