Turn on automatic volume ramp-up for a mailbox (campaign). Instead of sending the full email_per_day immediately, Mailivery starts low and increases daily volume over time according to the chosen rampup_speed, until it reaches your target: fast gets there in about 14 sending days, normal in about 30 and slow in about 60. Only days your sending schedule sends on count, so a weekdays-only schedule takes longer on the calendar. We recommend fast for any mailbox a few months old or newer, or with no warm-up or sending history — see Recommended Warm-Up Settings.
Not sure what value to use? See Recommended Warm-Up Settings — match your daily cold volume 1:1 (recommended max 50/day on Google and Microsoft), set response rate to 35–40%, and turn ramp-up on at
fastfor newer mailboxes.