Does time of day affect deliverability?

Mostly For Engagement, Not Filtering. Time of day affects when recipients see and engage with email. It does not directly affect spam filtering decisions.

Sending when recipients are active improves engagement, which indirectly helps deliverability. But filters do not penalize specific send times.

Optimize send time for audience behavior rather than filter concerns. Test what works for your subscribers. Time zone targeting and send time optimization serve engagement, not deliverability directly.