To determine if a message is spam, most spam filters check for appropriate email
authentication and look at your sending IP reputation. To avoid having your emails considered
spam, use email authentication and protect your sending reputation.
Required Editions
Available in: All Account
Engagement Editions
Email Authentication
Email authentication helps ISPs determine whether an email is coming from a legitimate source.
If you’re using Account Engagement to send emails, setting up email authentication is
crucial for good deliverability. Account Engagement requires you to verify sending domain
ownership. We also recommend setting up DomainKeys Identified Mail (DKIM) authentication.
Sender Policy Framework (SPF) authentication is configured for you by default. Almost all
ISPs and most spam filter providers check for these common forms of authentication before
they deliver an email.
Sending IP Reputation
Your sending IP reputation is based on many factors, including:
Bounce rates
Blocklistings
Spam complaints
Lack of sending IP history
If your sending IP reputation gets damaged, it can hurt your deliverability. Lower-volume
senders typically use shared sending IPs, so we take IP reputation seriously. If a client is
blocklisted for spamming, it can affect deliverability for other clients on the shared
IP.
Maintain a good IP reputation by following the Permission-Based Marketing policy, warming
up your IP address, and making sure that your lists are 100% opted-in and engaged.
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