Unable to send Excel file with macro to a certain email addresses using pop3 server(example email@example.com or JaneDoe@example.com). I can send a regular excel attachment with no macro and it sends fine to firstname.lastname@example.org or email@example.com (it takes about an hour to get there). I can send a test message with no attachments and it gets there in less than one minute. Yet, when I send to other email addresses (firstname.lastname@example.org or email@example.com or firstname.lastname@example.org), the emails with macro attachments get sent ok (1 minute). When I call the Pop3 support (windstream.net) they say that it is a problem with our servers (we are using exchange server). Even the senior support for windstream.net says that it is our server. I ask our Senior administrator and she says its their server. What server can it be? We are able to receive excel macros from other domains just fine.