r/AI_EmailMarketing

Every ESP migration guide says the same things: warm up your domain, export your lists, rebuild your flows. Then people move and their open and click rates still drop for a few weeks.

I'd like to hear what actually went wrong, not what the checklist said. A few places I suspect things break:

• Warmup. Did you send a lot from the new platform on day one, or ramp up slowly? If you were moving from a shared IP to a dedicated one (or back), did that change things?
• Authentication handoff. Did you have SPF, DKIM or DMARC records from the old ESP still in place, or a sending subdomain that didn't match? Did anything break in the gap between switching and fixing DNS?
• Suppression lists. Did your unsubscribes, hard bounces and spam complainers actually come across? Or did you find out the hard way when you emailed people who had already opted out?
• Engagement history. Your "engaged in the last 90 days" segments on the old platform depend on its event data. Did you start sending to everyone on the new platform because the new one didn't have that history?
• Flows. Did anything get double-sent or skipped during the cutover, like people getting two welcome emails or abandoned-cart emails firing for orders that were already placed?
• Things you didn't think to check. Link tracking domains, image hosting, preference center URLs, or old forms still pointing to the old platform.

If you've migrated:

1. Which platform did you move from and to, and roughly how big was your list?
2. What broke, and how long did it take you to notice?
3. What would you do differently next time?

If you're planning a migration right now, add what you're most worried about, and maybe someone who has already done it can answer.

Loops is a solid pick for simple SaaS lifecycle email. People usually start looking elsewhere when they need more complex logic, more control over transactional sends, or a different pricing model as their contact list grows.

1. Sequenzy. Best for SaaS and ecommerce teams that want AI agents to run their email.
   Lifecycle, campaigns and transactional email in one place, with MCP/API/CLI access so an agent can build and send flows. Pricing is based on sends rather than contacts.
   Limitation: it's newer, so the integration ecosystem is smaller than the big players'.

2. Customer.io. Best for technical teams with lots of event data.
   Very flexible event-driven segmentation and journeys.
   Limitation: more setup and a steeper learning curve than Loops.

3. Userlist. Best for B2B SaaS with company-level accounts.
   Understands users and the companies they belong to, which Loops-style tools often don't.
   Limitation: narrower focus outside B2B SaaS.

4. Encharge. Best for SaaS teams that want a visual flow builder.
   Behavior-based automations with a friendly UI.
   Limitation: smaller community and fewer resources.

5. Bento. Best for indie SaaS that wants marketing and transactional email with a dev-friendly API.
   Limitation: less polished for non-technical marketers.

6. Brevo. Best for budget-conscious teams that also want SMS or other channels.
   Limitation: lifecycle logic feels less SaaS-native.

Quick rule of thumb: simple SaaS onboarding, stay on Loops. Heavy event logic, Customer.io. B2B accounts, Userlist. Want agents running it, Sequenzy.

If you moved off Loops, what made you switch, and where did you end up?

I am currently in the process of releasing the beta version of Going Postal. Basically it's an AI-assisted real-time email designer with integration into the major ESPs (MailChimp, HubSpot, Klaviyo, Brevo). I built it after realising that even though I used Claude and Gemini to assist with coding emails for clients, I still spent a lot of time copying and pasting HTML and checking results in different emails preview apps. I wanted to have something I could chat with, build the emails, preview them and send to clients for review in one app.

I am looking for several Reditters to try it out and give me feedback on what they like, don't like etc. In exchange I am more than happy to offer free access for the rest of the beta period and 50% off for life when the product launches. All I need is honest feedback. I need max. 5 testers please.

Thanks in advance. I'm happy to share the link to the site if anyone is interested as well