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You havef ailed to send my email with xlsx attachment and told me 'This message does not meet our delivery requirements.'

cath.page

I have tried on several occasion to send an email with xlsx attachment and you tell me 'This message does not meet our delivery requirements.' I have sent emails previously successfully to the address without the attachment.? What is the problem?

I have tried on several occasion to send an email with xlsx attachment and you tell me 'This message does not meet our delivery requirements.' I have sent emails previously successfully to the address without the attachment.? What is the problem?

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Please understand that Thunderbird is your agent into the network, and displays messages back to you of any problems. Thunderbird has no control on what the network allows or disallows.