Recently moved to Klaviyo from Flodesk. Open rate of first email is down 40-50%

Hi Christina,

Welcome to the community! I understand how overwhelming and frustrating these deliverability issues can be.

Such deliverability fluctuations are bound to happen during initial migration days as you are building up the reputation with ISPs like Gmail. You must not get disappointed, have patience, and keep sending to your most engaged audience in low & slow manner (I.e. scale up your email volumes gradually). 

Please note, building up reputation and achieve better deliverability at Gmail takes 4-5 weeks depending upon your audience engagement, campaign performance and ISP feedback.

Few more tips to make sure you have the checklist in place-

• Have you suppressed all the blacklisted data (bounces, unsubscribe, spam complaints etc.) from Flodesk on Klaviyo?
• Have you created a 30 days warmup strategy plan? - segment, content, frequency etc.
• Have you setup your Postmaster for FROM domain to monitor domain/IP reputation health?
• Keep sending at a regular cadence and avoid adding any bad or unengaged data during warmup phase and maintain regular cadence and scale up gradually.

Heres a resource from Klaviyo that will be helpful - https://help.klaviyo.com/hc/en-us/articles/115005247008#:~:text=Deliverability%20is%20best%20measured%20through,and%20instead%20land%20in%20spam.

Let me know if you have any further questions.

Regards 

Mohsin