How many mails can be sent at a time?

Using google, yahoo and AOL smtp and PHPMailer how many mails can be sent at a time?

I tried to send 200 mails at a time from google after 40 or 45 it is giving the following e开发者_高级运维rror.

SMTP Error: Data not accepted.

and then i tried to reload and give only 1 address and the same error i have got.

what is the problem?

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You can't give a general answer to it. Big email providers such as Google have their own strategy to discover spammers. For example, I had no problem to send a single mail to 85 in CC, but sending 85 to a single recipient causes problems with my provider.

If you intend to send mass emails like a newsletter, I highly recommend using a professional service for it. Otherwise it is very likely that your email server gets black-listed or your sender email address marked as spam. Therefore, I can't recommend using typical newsletter plugins or modules for your favorite CMS if you got more than a couple of users registered.

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see http://www.emailaddressmanager.com/tips/email-address-limit.html for more info