What are the email sending limits of ISPs and other providers?

Major Internet Service Providers - Email sending limits & restrictions

This article contains information about the email sending limits and restrictions of many major email service providers. The information is intended as a guide only. Your ESP can change its outbound email policy at any time without any prior notification. It is always a good idea to contact your provider and ask about the email send rate before proceeding with a mass email campaign.

Additionally, it is best to use a mass email service, such as MailChimp, if you plan to send emails to large groups (more than 50 emails at a time). Read more about mass email options.

This article was last updated in April 2012.

Verizon

Send limit - no more than 100 recipients per message AND max 500 emails per hour
Other limits - max 2mb per message
Email Policy

Comcast

Send limit - no more than 100 recipients per message AND max 1000 emails per day
Other limits - max 15mb per message
Policies

EarthLink

Send limit - max 1000 emails per day
Email policy

Cablevision/Optimum

Send limit - maximum 50 emails at one time
Other limits - max 20mb per message
Email policy

Road Runner

Send limit - max 1,000 emails per day per sending IP address
Other limits - max 5mb per message
Email policy

Cox
Specific limits are not published because they vary from time to time depending on a variety of factors, but the limits are set such that a typical user should not be impacted. Cox uses other measures to control spam, including limiting the ability to send email from accounts that Cox believes are being abused, or have been compromised, for the purpose of sending spam.

Other limits - max 20mb per message
Email policy

AT&T Yahoo! (formerly SBCGlobal)

Send limit - no more than 50 recipients per message
Other limits - max 100mb per message

Charter

Send limit - maximum 50 recipients / emails per hour
Other limits - max 10mb per message

BellSouth
BellSouth does not publish a clear email send limit but their policy states "Sending mass, unsolicited e-mail by Service users is prohibited. BellSouth Internet Services reserves the right, in BellSouth’s sole discretion, to determine whether such email constitutes unsolicited messages or transmission."

Send limit - BellSouth’s sole discretion
Other limits - max 10mb per message
Email policy

Web Email Account Providers - Email sending limits & restrictions

Rackspace

Send limit - no more than 250 recipients per message in any given period of time
Other limits - outgoing messages sent via Rackspace Mail can not exceed 20Mb per email (including attachments)
Email policy

Google

Send limit - no more than 500 recipients per message for the web interface, or max 100 recipients when using an email client software such as Outlook, Thunderbird, etc.
Other limits - max 10Mb per message (including attachments)
Email policy

Windows Live (a.k.a. Hotmail, MSN)

Send limit - no more than 100 recipients per message AND max 300 emails per day
Other limits - max 50Mb per attachment AND max 10Gb per message (including attachments)
Email policy

Yahoo!

Send limit - no more than 100 recipients per message AND max 500 emails per day
Other limits - max 10Mb per message for free Yahoo! Mail, or 20Mb per message for Yahoo! Small Business Mail
Email policy

Lycos

Send limit - max 25 recipients per message and max 250 emails per day
Other limits - max 35Mb per message
Email policy

AOL

Send limit - no more than 100 recipients per message or 500 recipients per connection in any given period of time
Other limits - max 25Mb per message


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