Office365 email sending limit
Per day: 10 000 recipients
Per hour: There’s no hourly limit, but a limit per minute, which is 30 messages max
Additional good-to-know: If you take your outreach seriously, you won’t even get close to the daily limit of Office 365. 10K per day sounds ridiculous for quality email outreach. But, be aware of the limit per minute, especially if you use some automation to send your outbound campaigns.
Google Workspace (formerly G Suite) email sending limit
Per day: 2000 messages (500 on trial)
Per hour: Officially, there are no hourly limits
Additional good-to-know: If you exceed the limits, your account will be blocked for up to 24 hours.
Free Gmail email sending limit (NOT SUPPORTED)
Per day: 100 messages maximum via SMTP (but 500 emails via browser).
Per hour: There is no official information. However, from our experience, it’s good to send no more than 20 messages an hour from a free Gmail account.
Additional good-to-know: If you exceed Gmail’s limit for sending emails, your account will get blocked for 1-24 hours. We usually don’t recommend sending cold email campaigns from a regular free Gmail account but setting up an address on a separate domain using Workspace Google (formerly G Suite) instead.
Outlook.com email sending limit
Per day: 300 emails maximum for verified Outlook.com email addresses with a good reputation.
What does it mean that an Outlook.com email address is verified and has a good reputation? Your email address reputation is determined by Outlook.com based on factors, such as:
your email account’s age (if it’s less than 30 days old, your email sending limits are lower)
how often you use your outlook.com account (the more often, the better your reputation gets)
whether your email account is verified (you can verify it under this link).
Host Gator email sending limit
Per day: 12,000
Per hour: set to 500 emails per domain – each subdomain gets its own limit of 500 emails/hour
Additional good-to-know: A mailing list containing over 900 addresses is only allowed to be sent during off-peak hours. A mailing list larger than 5,000 requires a dedicated server or VPS hosting solution from Host Gator. Dividing the list into smaller ones is not permitted. Such limits shouldn’t worry you, though, as sending such quantity of emails is against the very idea of cold emailing. Quality above quantity!