Hi SallyHECB,
Thanks for your response. If you're currently experiencing issues with some emails failing to send successfully while sending a large number of emails, another workaround is to send them in batches. For instance, if you're sending 100 emails, you can send them in batches of 20 payslips for each batch, starting with the first batch and then proceeding to the second batch.
Feel free to post again, we're happy to help!
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Regards,
Earl