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Painting of a woman writing a letter while her maid waits by the window
Watercolour of a girl writing at a desk in a room full of plants
A handwritten letter from 1585, opened flat, with its address on the back
A brass pen nib, close up

Mailbox warm-up

Warm-up means a new mailbox starts with few emails a day and sends more each day, so providers learn to trust it.

Mailbox warm-up

Mailbox warm-up is raising the number of emails a new or quiet mailbox sends a little each day, instead of sending hundreds at once. Mailbox providers judge a sender partly by its history; a sudden burst from a mailbox with none looks like spam. A warm mailbox is one that has sent steadily for a while and built that trust.

In Scrisly, a mailbox's first sending day is capped at 10 emails, with 5 more allowed each day after, up to the daily limit you set. Emails are spaced with a minimum gap and some random jitter, inside the sending hours of the campaign.