I am no techy when it comes to emails but I have been told by IT-friends that email attachments can ‘bloat’, doubling their size! Other problems can be file corruption, where the file is unusable by the time it has reached the other end.
Due to the fact that we receive a ridiculous amount of artwork every day, we have had to reduce our mailbox capacity to prevent large attachments coming through. If an email is too large for our inbox, it will be rejected by our server and depending on the senders server set-up they will get notified of the rejection, or, as is often the case, not.
We do say not to send any attachment over 1MB, but in truth, 4/5MB can be sent but we cannot guarantee it will be received.
There are ways around this problem, but the predominant ones seem to be either online file transfer services or your own FTP server.
If you have your own FTP server we can gratefully receive artwork on these, all we would need are log in details and we will be able to download the appropriate artwork (please do let us know the file name and file path if there are multiple artworks/folders available).
The dedicated file transfer sites work on the basis that you upload the artwork to them and then they send a link to the file which can be downloaded to the recipient. They can then download the file at their leisure.