email error

[donbs]

Message could not be sent. Error message from mail transport server: 452 - 452 4.1.1 ... temporary failure

[donbs]

What is happenimg,it eill not send the email

[ComcastSPAAbuse]

@donbs 

Hello,

The errors below are either produced due to an excessive number of recipients in your outbound message or an invalid recipient(s).

You will want to make sure the number of users you are sending to in a single message do not exceed the amounts listed in https://postmaster.comcast.net/smtp-error-codes.php#452. You will also want to ensure there are no recipients that are no longer valid or are spelled incorrectly.

[BruceW]

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@ComcastSPAAbuse wrote: ... do not exceed the amounts listed in https://postmaster.comcast.net/smtp-error-codes.php#452. ...

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https://postmaster.comcast.net/smtp-error-codes.php#452 says

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"Comcast allows 1000 emails per session."

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But https://www.xfinity.com/support/articles/limitations-on-sending-email says

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Xfinity customers can email up to 1,000 recipients per day.

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Which is correct? What is a "session", and is the 1,000 recipient limit "per session" or "per day"?