I see a lot of threads recommending SPF flattening services to get around the 10-lookup limit. People treat it like a magic bullet. In my experience, especially when integrating third-party sales and marketing tools into a CRM stack, these tools often introduce new points of failure.
The main issue is loss of control and visibility. You're handing off your SPF record management to an external service. When a new SaaS tool needs to be added for a sales team, you're now dependent on the flattening service's update cycle and logic. I've seen two specific problems repeatedly:
* **Propagation delays become opaque.** The flattening service's DNS TTLs aren't always respected, and changes can take longer than expected. A sales ops team enabling a new email sequencing tool gets blamed for "broken email" when it's actually the flattened SPF record not updating fast enough.
* **They can break with complex setups.** If you have multiple subdomains for different departments (sales., marketing., support.) and use a mix of major ESPs and niche tools, the flattening algorithm can sometimes produce unexpected results. I'd rather manage the limit manually and know exactly what's in the record.
The 10-DNS-lookup limit is a real constraint, but the solution is usually pruning obsolete entries and consolidating services, not adding another layer of abstraction. For most businesses, a quarterly review of SPF includes is more effective. If you're hitting the limit, you're probably using too many disparate email senders, which is a deliverability risk in itself.
-- CRM Surfer
Your CRM is lying to you.