Why are pdfs getting stuck in the Outlook outbox for so long

Hi Katewisco!
It might be possible the size of the .PDF is large in size. Depending on your email provider, it it's close to the limit of 25MB or for Microsoft Outlook, 20 MB, the file might take a bit longer to send over. It might be worth contacting your email provider for support if the files are much smaller and the time it takse to send is a few hours.

You can reduce the size of your .PDF within Adobe Acrobat or use a transfer service like WeTransfer to send over larger .PDFs.