Sending automated invoices and statements

Hi there, we have multiple clients one by one switching to automating email sending for invoices and statements etc. The system works perfectly if you only send one but it starts to have problems when it sends in bulk. The internal systems work fine and show no errors and they get sent but never received if bulk sent. Is there anyway or service we can use to achieve other than whitelisting the sender address on the receiving end?
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grovenetsupportAuthor Commented:
Thanks for the reply, we kind of didn't want to have to go down the paid route if we didn't have to as I know of these services. Is there something else?
David Johnson, CD, MVPOwnerCommented:
starts to have problems when it sends in bulk. what are the problems? are you using dbmail for both scenarios?

they get sent but never received do you have your own exchange? if you track the message(s) what are the results?
grovenetsupportAuthor Commented:
They are a hosted exchange customer and the host says the don't filter outgoing mail they just let it through. When bulk the customer never receives it but if we change the parameters to only send to one client gets there now problem. Software has been checked and working properly I can only assume they are landing in the spam filters which we are checking now
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