Our system is currently configured to allow a maximum of 50 recipients per single message.
This is done because many 'remote' email servers will reject messages containing large numbers of recipients - if possible we would recommend you try to keep to less than 10 recipients per message.
If you are using mail-merge or mailing list software with AuthSMTP check the configuration to see if it will split a large mailing into multiple separate email messages - they usually allow you to either specify a number of recipients per message or one message per recipient.
Notes:
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