Greylisting in the context of URIBL is not the same as mail server greylisting (which temporarily defers messages).
URIBL greylisting refers to a domain reputation category, not a delivery delay.
If a link or domain in your email (such as infusionsoft.com or your custom tracking domain) appears on the URIBL greylist:
- Most large mailbox providers (e.g., Gmail, Microsoft, Yahoo) will not block or filter your mail based solely on this status.
- A small number of smaller ISPs or spam filters that enable URIBL greylist checks may flag or score your messages higher for spam potential.
- In most cases, deliverability impact is minimal.
Why Domains Get Added to a Greylist
URIBL’s greylist includes domains that:
- Appear frequently in bulk marketing email (including opt-in messages).
- Belong to ESPs or shared-sending environments where individual list quality varies.
- Have been seen in messages sent to inactive or abandoned addresses.
- Are under observation due to mixed engagement or sending behavior.
This doesn’t necessarily indicate a problem with your account or sending practices — it’s part of normal monitoring for bulk senders.
How to Maintain a Positive Reputation
While being greylisted by URIBL is common for legitimate ESPs, sender reputation and list quality are still crucial to inbox placement.
Follow these best practices to minimize risk and improve deliverability:
- Maintain clean, engaged lists — regularly remove unengaged, bounced, or invalid contacts.
- Use confirmed opt-in (double opt-in) when possible to ensure consent.
- Avoid spammy content and excessive image-to-text ratios.
- Authenticate your domain with SPF, DKIM, and DMARC.
- Monitor engagement trends — low engagement can negatively affect deliverability.
- Comply with CAN-SPAM, CASL, and GDPR where applicable.
Keap’s Commitment to Deliverability
You can be confident that Keap (formerly Infusionsoft) operates a trusted, compliant, and high-performing email network:
- Sends 130+ million emails per week on behalf of customers.
- Maintains 99.5%+ average delivery rate across the network.
- Uses infrastructure fully SPF/DKIM/DMARC compliant.
- Employs a dedicated deliverability and compliance team to monitor IP reputation, address abuse, and work with industry partners to resolve issues quickly.
In summary:
URIBL greylisting is normal for large, reputable ESPs and does not indicate spam activity. Maintaining clean sending practices and authenticated domains ensures consistent inbox placement and long-term deliverability success.