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What does "error occurred, mail server responded 5.1.1 not our customer"mean?

mvcurry
mvcurry
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The recipients are in my address book and I need to send the same message to 15 members. What do I have to do to get the message sent?

The recipients are in my address book and I need to send the same message to 15 members. What do I have to do to get the message sent?

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The recipients are in my address book and I need to send the same message to 15 members. What do I have to do to get the message sent?

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Waini123123
Waini123123
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Chosen Solution

The recipients are in my address book and I need to send the same message to 15 members. What do I have to do to get the message sent?