Remove "via" information from emails not sent through Gmail
Gmail checks whether the messages you send are authenticated.
- If you send messages using a bulk mailing vendor or a third party affiliates, check out Gmail's Bulk Senders Guidelines, including: Publish an SPF record that includes the IPs of the vendor or affiliates which send your messages.
- Sign your messages with a DKIM signature that is associated with your domain.
- Make sure the domain in the "From:" address matches the domain you're using to authenticate your emails.
Emails can be authenticated using SPF or DKIM.
SPF specifies which hosts are allowed to send messages from a given domain by creating an SPF record.
DKIM allows the sender to electronically sign legitimate emails in a way that can be verified by recipients using a public-key.
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