Warmup
Connected Gmail accounts send small, friendly emails to each other (and reply) every day to build sender reputation. Enable at least two Gmail inboxes for warmup to work.
Inboxes
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How it works
Each enabled inbox sends up to its daily target of short messages to your other enabled inboxes, which automatically reply. This trains spam filters to trust the sending addresses.
Start small (5/day) and ramp up by a few each week. Run warmup daily — connect a cron later if you want it fully automatic.