# Daily sending limit explained | Propel

Source: https://runpropel.com/glossary/daily-sending-limit

Glossary

# What is a daily sending limit?

A daily sending limit is the most emails one mailbox may send in a day. It keeps a sender looking like a person rather than a machine, protects the mailbox's name with mail providers, and keeps one bad day from doing lasting harm.

## Why have a limit?

Mail providers judge each mailbox by how it behaves. A person sends a few dozen emails a day, spread out. A mailbox that sends hundreds at once, or doubles its volume overnight, looks like spam, whatever the emails say.

## How high should it be?

Lower for a new mailbox, rising slowly as it builds a history of mail that is delivered and answered. If you need to reach more people, more mailboxes at a modest limit each is safer than one mailbox pushed hard.

## What does Propel do?

Each mailbox you connect has a limit of 30 emails a day to begin with, fewer while it warms up, and its sends are spaced out across the day rather than fired at once. See the guide [Connect a mailbox and send safely](https://runpropel.com/guides/mailbox).

Where Propel does this

[Connect a mailbox →](https://runpropel.com/guides/mailbox)

Related terms

- [Cold-email warm-up](https://runpropel.com/glossary/cold-email-warm-up)
- [SPF, DKIM and DMARC](https://runpropel.com/glossary/spf-dkim-dmarc)
- [Cold email](https://runpropel.com/glossary/cold-email)
- [All terms](https://runpropel.com/glossary)