Friday Is No Longer the Email Marketing Graveyard

For years, Friday and Sunday were treated as the email marketing graveyard. You all know I follow the Do This Not That podcast. It is always in the top 5 if not on top each week - and once again Jay came up with some interesting data. I then verified it with a few sources. And guess what - the algorithms have changed AGAIN.

The common advice was simple: send on Tuesday, Wednesday, or Thursday because people are focused, working, and more likely to pay attention. Friday was often dismissed because people were mentally checked out and moving toward the weekend.

New 2026 data suggests that assumption deserves a second look.

Omnisend analyzed roughly 26 billion marketing emails and found that Friday had the highest conversion rate of the week at 0.081%. The strongest single time slot in the study was Friday at 7 a.m., with a 0.138% conversion rate. Omnisend also found that Friday had the highest send volume, with about 4.51 billion emails sent. (MediaPost)

That matters because Friday is not just quiet space in the inbox. It is competitive. But even with that competition, the data shows people are still taking action.

Sunday also deserves more attention than many marketers give it.

The same Omnisend research found that Sunday performs better than many marketers might expect, especially around late morning and midday. The 11 a.m. Sunday open rate was 33.69%, one of the strongest open rates of the week. The study also noted that 12 p.m. Sunday produced a healthy conversion rate, pointing to a possible lunch-hour window when subscribers may have more time to browse and respond to the right offer. (MediaPost)

MailerLite’s 2026 study supports the broader point that send-day assumptions need to be tested, not blindly followed. MailerLite analyzed more than 2.1 million email campaigns and found that Friday performed strongly for engagement, especially when comparing open and click behavior by time of day.

The real lesson is not that every business should suddenly move all emails to Friday or Sunday.

A retail brand, financial advisor, business coach, and B2B software company may all see different results. Audience habits, offer type, industry, urgency, and buying intent still matter.

The better takeaway is this: older email rules may no longer be enough.

Friday should no longer be automatically dismissed. Sunday should not be ignored either. Both days may offer real opportunities when the message is clear, timely, and useful.

So instead of assuming certain days will not work, test them.

Send the same type of email on your normal day and compare it with a Friday or Sunday send. Watch clicks, replies, appointments, purchases, and conversions.



Your audience will give you the real answer.

In 2026, the smartest email strategy is not following old habits. It is testing what your audience actually does.