Hello.  Today in Outlook for Mac I sent an email (139 KG total including a 58 KB attachment).  The email showed up as sent in its entirety in my sent items and in Microsoft 365 online for small business.  However, recipients viewing the email on PC's using outlook only received the attachment and 1/3 of the text of the email. Those viewing the email on a mac could view the entire email and the attachment. I re-sent the email without the attachment, and everyone could view the entire email and attachment.  I did not exceed the email size limit or attachment size limit. I have never had this happen before, and I regularly send attachments. What could cause this?  Maybe I should call Office 365 tech support to go through it?  I don't want this to happen again since I use this program for work.

Thanks!