Worth flagging up front: the answer diverges a lot depending on who's actually going to use this, and "email marketing platform" at your headcount usually means a marketing automation suite rather than an email tool. Here's how I'd frame it.
## The main fork: B2B or B2C?
**If you're B2B** (long sales cycles, lead handoff to sales reps):
- **Adobe Marketo Engage** — the demand-gen standard. Deepest lead scoring, nurture, and attribution. Also the most complex; assume you need a dedicated marketing ops person or agency partner.
- **HubSpot Marketing Hub Enterprise** — has become genuinely enterprise-viable. Meaningfully faster to deploy, better UX, lower TCO. The tradeoff is less flexibility on very complex data models.
- **Salesforce Marketing Cloud Account Engagement (Pardot)** — mainly worth it if you're deeply committed to Salesforce and want native object-level integration.
**If you're B2C** (high send volume, mobile/push, consumer lifecycle):
- **Braze** — best-in-class cross-channel orchestration.
- **Iterable** — similar territory, often better pricing.
- **Klaviyo** — if there's a commerce component.
- **Salesforce Marketing Cloud (Core/ExactTarget)** — powerful but the heaviest lift; strongest case is if it's already in your Salesforce ELA.
If your marketing team hasn't yet told you which of these categories you're in, that's the conversation to have before running any RFP.
## The thing I'd actually look at first
At 5,000 people, you almost certainly already have three to eight email tools in production — a Mailchimp account on someone's card, HubSpot in a business unit, Marketo at corporate, maybe a legacy Eloqua contract nobody has touched. Before selecting anything, pull your AP data and SSO/OAuth logs for email and marketing categories. The consolidation savings frequently exceed anything you'll negotiate on a single new contract, and it materially strengthens your position when you go to market as a consolidator rather than an incremental buyer.
## Procurement-specific terms that matter here
These platforms have some of the nastiest commercial structures in enterprise SaaS:
- **Contact-based pricing ratchets.** You pay on database size, and databases only grow. Negotiate a contact tier with generous headroom, plus a *written* right to suppress/archive unengaged contacts without counting them. This is the single largest source of unbudgeted spend in this category.
- **No-downgrade clauses.** Most of these vendors won't let you reduce contacts or seats at renewal. Push hard for a downward flex right of at least 15–20% annually.
- **Implementation costs.** Marketo and SFMC commonly carry professional services at 0.5–1.5× year-one license. Get that scoped before you sign the license, not after.
- **Overage rates.** Cap them and get them defined in the agreement, not the order form's referenced price list.
- **Auto-renewal and notice windows.** 90-day notice with auto-renewal is common. Shorten it or add a calendar alert with buffer.
- **Termination assistance and data egress.** Explicit right to export contact data, engagement history, and templates in usable format at no charge.
- **Deliverability.** Dedicated IPs and IP warming are often priced separately. Ask.
**Timing leverage:** Salesforce's fiscal year ends Jan 31, Adobe's Nov 30. HubSpot and Braze are calendar-year. Q4-of-their-fiscal is where the discounting lives.
**Pricing benchmarks:** I'd avoid quoting figures with confidence — this category's pricing is opaque and moves. Vendr, Tropic, or Spendflo have real transaction data for these specific vendors and will pay for themselves on a deal this size.
## Compliance
Baseline is CAN-SPAM plus the state privacy patchwork (CPRA and successors). If you're in healthcare or financial services, HIPAA BAA availability or FINRA-compliant archiving narrows the field considerably and should be a gate, not a scoring criterion. Same if you have EU contacts and need specific subprocessor and transfer-mechanism commitments.
If you can tell me your industry, whether you're B2B or B2C, and what CRM you're on, I can narrow this to two or three and tell you where the negotiation pressure points are for those specific vendors.