Description of Google Postmaster tools

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Graficul SPF: Shows the percentage of email that passed SPF out of all emails from that domain that attempted SPF. This excludes any spoofed email.
Graficul DKIM: Shows the percentage of emails that went through DKIM out of all emails from that domain that attempted DKIM.
Graficul DMARC: Shows the percentage of email that passed DMARC alignment versus all emails received from the domain that passed either SPF or DKIM.

Feedback loop
This only applies to .com recipients.

For businesses that send a high volume of emails, Feedback wuhan mobile database Loops (FBLs) provide a valuable tool. They help identify campaigns that are triggering a wave of complaints from Gmail recipients. This information is especially critical for email service providers (ESPs) to identify and address potential misuse of their platforms.

So, let's see what it's all about. For every email you send to @gmail.com addresses, you add an additional header.

ID de feedback: CampaignIDX:CustomerID2:MailTypeID3:SenderId
This header will allow FBL to identify campaigns so you can detect what may be causing delivery issues. These will be reported and made available in the FBL dashboard.