I am hoping may be someone can confirm this for me. I sent a large email to my tax agent yesterday. The file is only 9Mb. It was sent successfully as indicated by the messages and it also appeared in the "Sent Items" folder.

Nothing unusual or suspicious there. Then some time later, I received an email from an unknown address, telling me that the file is too big, and that it was sent unsuccessfully. I checked the sender address, and here it is...
postmaster @ apac.local

I am not able to contact the receiver there and then because he was not at work yesterday and next Monday. So I am wondering if anyone can please confirm if it is a dodgy email or legit at all.