Rotation spreads your sending across every connection you have, which spreads the reputation load: 1,000 emails over 5 connections is roughly 200 each. You can connect as many senders as you like, from any provider, including several accounts of the same provider.
Where it lives:
- Go to Delivery, then the Sending tab.
- Scroll below the providers table to the Send Rotation and Warmup panel. It appears once you have at least one real connection (WordPress wp_mail never rotates, it is only ever the last resort).
The three modes:
- Priority + failover. The classic behaviour and the default: the lowest priority number sends everything, and the next takes over if it has trouble. Updating changes nothing until you choose a different mode.
- Rotate evenly. Sends are spread across every eligible connection. The picker always chooses the connection that has sent the least today, so the split stays even all day, and a connection you add mid-day catches up instead of being flooded.
- Weighted shares. You give each connection a weight, for example 50/20/10/10/10, and sends follow those proportions. A weight of 0 keeps a connection out of the rotation but still available as backup.
Failover never goes away. Whichever mode picks the sender, a connection that errors is skipped and the next in line delivers the email. Rotation decides who goes first, never whether your email goes out.
The panel shows each connection's sends today, its share, and its remaining capacity, so you can see the split working. A per-broadcast Send Via choice on the composer still overrides everything for that one send.